May delivered a steady cadence of openSUSE Tumbleweed snapshots across the major desktop stacks with KDE Gear 26.04.1, KDE Frameworks 6.26.0, Plasma 6.6.5 and GNOME 50 minor releases. Mesa made a couple leaps with the 26.1 series with the new Vulkan 1.4 Application Programming Interfaces, and the Linux kernel progressed from 7.0.5 through 7.0.9 with significant security and driver fixes. Sysadmins received a major AppArmor 5.0 release and a fresh Apache HTTP Server 2.4.67 carrying many Common Vulnerability and Exposure fixes.

Other notable bumps include libusb 1.0.30, GnuPG 2.5.20, LibreOffice 26.2.3.2, PostgreSQL 18.4, rsync 3.4.3, poppler 26.05.0, and Expat 2.8.1.

Security received heavy attention with Apache HTTP Server, PostgreSQL, rsync, dnsmasq, jq, PHP, OpenEXR, and the Linux kernel all receiving multiple CVE fixes.

As always, be sure to roll back using snapper if any issues arise.

For more details on the change logs for the month, visit the openSUSE Factory mailing list.

New Features and Enhancements

KDE Gear 26.04.1: Akonadi fixes a crash in EntityTreeView when selecting multiple items, and KOrganizer resolves black squares in the todo view and re-enables icons in monthview. Dolphin refines the selection panel and search popup behavior. Kate restores middle-click closing of tabs when the close button is disabled, Konsole prevents QTabBar from closing tabs on stray middle clicks, and Okular hardens fax handling against malformed .g3 inputs. Umbrello gets six bug fixes including diagram-load and Qt6 configuration crashes, and Itinerary adds new Condor PKPass and monbus.es ticket extractors.

KDE Frameworks 6.26.0: KIO adds the Startpage search provider, expands KFilePlacesModel with kdeconnect device support, gains MIME-type detection from text content in the paste flow, and exposes the current folder in the file widget placeholder. KCoreAddons introduces KAboutRelease for listing application release notes, parses AppStream release notes, and switches to libmount for filesystem-type detection where available. KImageFormats corrects EXR loading from Photoshop 2026 saves, plugs JXR memory leaks, and improves EXIF handling. KHolidays introduces HolidayCategories and fixes Philippines Easter holidays.

Plasma 6.6.5: KWin gains numerous DRM backend fixes including correctly updating outputs only on changed GPUs, preserving custom output modes across reboots, setting full color range for RGB planes on NVIDIA, and avoiding multi-GPU copies with unsupported formats. Input handling is hardened by mapping devices to device outputs (not logical ones), processing key repeat before the accessibility monitor, and cleaning up keyboard grabs on shutdown. KScreen hides the DDC/CI option when HDR is enabled and prevents off-by-one gaps when creating replicas. Discover corrects text color inversion in ProgressView, and Plasma Workspace fixes klipper clipboard updates, lockscreen timezone init races on multi-screen, and broken text legibility with the Air and Breeze Light themes. Spectacle keeps the application alive briefly after copying screenshots and fixes magnifier activation during hover events. PowerDevil addresses screen brightness getting stuck at 30 percent after a restart.

GNOME 50.1 and 50.2: These point releases bring stability and usability fixes across the GNOME desktop. GDM 50.1 fixes a failure to properly terminate conflicting graphical sessions started outside of GDM (such as ThinLinc or TigerVNC) by querying logind directly, and resolves Plymouth hanging indefinitely on headless systems or those without monitors. A bug incorrectly setting XDG_SESSION_TYPE=wayland on X11 sessions was corrected, along with XDG_DATA_DIRS construction that could prevent GNOME Shell from finding its files. GNOME Shell 50.2 fixes extending screenshot area selection to monitor edges, adds rate control to VA-API H.264 screencast pipelines, and restores the “Install Updates” checkbox in the power-off/restart dialog. Autorun notifications for USB drives, spinner resets during overview search, and wiggle feedback on non-password auth failures are all corrected, and the audio input icon now only appears when actually recording. GNOME Control Center 50.2 fixes the “Show Content” notification setting, relaxes app-id validation for Global Shortcuts, and improves mobile-width label fitting in Device Security and Wellbeing panels. GNOME Session 50.1 fixes a double-free bug. For Tumbleweed users, these updates improve login reliability, screencast quality, and overall GNOME desktop polish.

KDE Network File Sharing 26.04.0: This update refactors the file properties plugin initialization and now automatically enables and starts the Samba service if needed when sharing folders. Service aliases are handled correctly, the user list in combo boxes is clipped with scrolling disabled for better usability, and a regression in smbd path lookup was fixed.

AppArmor 5.0.0: This major version bump from the 4.1 series is a significant milestone for the mandatory access control framework. The release modernizes the parser and userspace utilities, adopts a new ABI abi/5.0, and introduces broader profile updates. Profiles for samba, dovecot, postfix, wpa_supplicant, and syslog-ng are refined to better handle modern filesystem layouts. The full upstream changelog is available at the AppArmor 5.0 release notes wiki.

GnuPG 2.5.20: This update implements GCM encryption in gpgsm (decryption was already supported in earlier versions), adds the --attribute option and SETATTR server command for including arbitrary signed or unsigned attributes in signatures, and introduces a new system attribute _signingCertificateV2. A possible double free in the CMS parser is fixed, along with a buffer overflow in scdaemon when handling SC-HSM cards with RSA keys larger than 2 kilobits. Several agent and keyboxd fixes correct loopback pinentry caching and PUT_SECRET input handling.

libusb 1.0.30: This update introduces new APIs libusb_get_device_string() and libusb_get_session_data() for accessing device strings without opening the device and retrieving OS-specific handles. Device removal races on non-hotplug builds are fixed and descriptor parsing memory safety is improved.

poppler 26.05.0: This jump from 26.02.0 rolls up three upstream releases. The release improves reconstruction of damaged files, fixes crashes in malformed documents, and removes the PSOutputDev “pipe as filename” feature for security reasons. pdftotext gains a -remove-hyphens option and no longer aborts on empty strings. The qt5/qt6 search APIs receive a fix for inverted continuation rectangles, and the GPG signature backend correctly marks qualified keys.

gpg2 and libksba 1.8.0: The S/MIME-related X.509 and CMS support library jumps from 1.6.8 to 1.8.0. New functions include ksba_cms_add_attribute and ksba_cms_get_attribute, support for building AuthEnvelopedData, and corrections to silent truncation of 64-bit length fields and overflow guard conditions in _ksba_ber_read_tl.

open-vm-tools 13.1.0: This major version bump introduces support for GTK4 alongside continued GTK3 compatibility. The configure script accepts options to restrict the build to either toolkit; otherwise it picks the latest available. Several upstream GitHub issues are resolved as documented in the 13.1.0 Release Notes.

fwupd 2.1.3: This update for the firmware update daemon continues to add features and hardware coverage. New capabilities include Redfish bearer token authentication, support for several XMC SPI chips, parsing of JCat files without libjcat, native CBOR parsing (dropping libcbor2 as a dependency), and an HSI check for AMD SB-7033 (a.k.a. EntrySign). The earlier 2.1.2 release also added native EFI authenticated variable loading with ContentInfo headers and decompression-ratio limits to prevent ZIP-bomb-style emulation parsing. New hardware support spans the SHIFT6mq, SHIFTphone 8, Google Moonstone, Lenovo USB-4 dock, HP 400/405 Mouse, Parade USB hubs with GPIO control, Pixart PLP239 devices, Raydium TP devices, Sunplus cameras, and the LX Semicon SW42101 touch controller.

python-cryptography 48.0.0: A major version bump that drops Python 3.8 support and changes X.509 CRL parsing so that a mismatched inner TBSCertList.signature and outer signatureAlgorithm raises a ValueError. ML-KEM and ML-DSA are now supported when building against OpenSSL 3.5.0 or later (in addition to AWS-LC and BoringSSL), bringing post-quantum algorithms to upstream wheel users.

Key Package Updates

Linux Kernel 7.0.9: The kernel progressed through 7.0.5, 7.0.6, 7.0.7 and 7.0.9 during the month, accumulating a substantial pile of security and stability fixes. The 7.0.5 release fixed a buffer overflow in vrealloc_node_align() along with a deadlock in mmap_prepare error handling when holding rmap. The crypto subsystem received extensive fixes including memory leaks in atmel-aes, ccree, and nx842, a use-after-free in atmel-sha204a removal, and short digest rejection in authencesn. netfilter rejects zero shifts in nft_bitwise, and IPsec (xfrm) avoids in-place decryption on shared skb fragments. NTFS3 receives integer overflow and buffer boundary checks in run_unpack(), and EROFS fixes an unsigned underflow in LZ4 overlap handling. The 7.0.6 follow-up added an rxrpc fix for DATA/RESPONSE packets when paged frags are present and an ALSA fasync state-check serialization. The 7.0.7 release brought multiple CVE fixes detailed below, scsi target configfs bounds tightening in snprintf(), ipmi event/receive message limits, KVM x86 shadow-paging use-after-free protection, smbdirect MR registration fixes for coalesced SG lists, and many wifi mt76 fixes for mt7921/mt7925. The 7.0.9 jump adds HID fixes (PlayStation num_touch_reports clamp, appletb-kbd UAF on inactivity-timer cleanup, pidff integer overflow), drm/gpusvm correctness fixes, and many spi controller deregistration fixes.

curl 8.20.0: This release addresses half a dozen security vulnerabilities. RTMP support is dropped entirely and SMB support is now opt-in. A new thread pool and queue system was added for async resolution, and HTTPS DNS record resolution is made more reliable. Credential handling is hardened across redirects, with digest nonces cleared on cross-origin redirects and proxy credentials cleared on port or scheme changes. The alt-svc and HSTS lists are now capped (at 5,000 entries) and expired entries are skipped when reading from file. HTTP/2 now prevents secure schemes being pushed over insecure connections, and MIME processing limits nesting to 40 levels.

GnuTLS 3.8.13: This major security release addresses more than a dozen vulnerabilities. Three high-severity DTLS reassembly issues are fixed. Medium-severity fixes address a use-after-free in gnutls_pkcs11_token_set_pin(), an overread in RSA key exchange with PKCS#11 keys, CN fallback suppression issues with URI/SRV SANs, and intersecting empty name constraints. Lower-severity fixes cover a multi-entry OCSP response revocation bypass, a timing side-channel in PKCS#7 padding removal, and an off-by-one in PKCS#12 bag bounds checking. HPKE (Hybrid Public Key Encryption, RFC 9180) is available as a technology preview, ML-DSA public key derivation from expanded private keys (RFC 9881) is supported, and building with Nettle 4.0 is now possible. TLS 1.3 client certificate selection is fixed for servers advertising only rsa_pss_rsae_* algorithms, and kTLS ChaCha20-Poly1305 IV handling is corrected for TLS 1.2.

GLib 2.88.1: This update fixes a miscompilation with GCC 16 caused by incorrect function attribute usage. A flag confusion security issue in GRegex when using G_REGEX_RAW is resolved, which could result in unbounded out-of-bounds heap reads off the start of a regex input string. Various minor security issues are also addressed, typically involving small out-of-bounds reads or scenarios relying on discouraged P2P D-Bus configurations.

SQLite 3.53.1: The recovery extension is hardened against SQL injections from the sqlite_schema table of databases being recovered. A crash in sqlite3_deserialize() when overwriting a database with an open transaction is fixed (a bug dating back to version 3.23.0). A single-byte out-of-bounds read in the session module when concatenating patchsets is corrected. The EXISTS-to-JOIN optimization receives fixes for OR-optimization early-exit logic and OFFSET clause handling. A printf() optimization regression causing sqlite3_snprintf() to incorrectly truncate floating-point conversions is resolved, and sqlite3_str_free() no longer crashes when called on objects returned after an out-of-memory condition.

Mesa 26.1.0 to 26.1.1: Version 26.1.1 fixes RADV sample shading with required sample-shaded inputs, VRS with mipmaps on GFX10.3, acceleration structure copies with DAC, and enables a VM map update workaround for Forza Horizon 6. ANV (Intel) adds a SIMD32 requirement heuristic for Dragon Dogma 2, fixes usage flags not propagated to ISL for explicit layouts, bumps the max compute workgroup count, and corrects timebase scale precision loss across 2^32 ticks. The Vulkan 1.4 API is now implemented, with support varying by driver with version 26.1.0. Experimental support for Intel Nova Lake P hardware is introduced. Zink now supports OpenGL ES 2.0 on PowerVR GPUs, expanding its reach to embedded hardware. New Vulkan and OpenGL extensions are supported across drivers including VK_EXT_present_timing, GL_NV_timeline_semaphore (RadeonSI), VK_QCOM_image_processing (Turnip), VK_KHR_present_id, and VK_KHR_present_wait. Rusticl (OpenCL) now requires a static C++ standard library. The update delivers broader Vulkan support, improved virtualization performance, and expanded hardware compatibility.

GStreamer 1.28.3: A bugfix release with security fixes across the framework. Highlights include applemedia vtdec stability, MoltenVK integration and planar video format handling fixes, an audioresample regression fix on armv7hf, bpmdetect corrections for stereo and multi-channel modes, and webrtcsink support for the imx8mp vpuenc_hevc H.265 encoder. Codec parsers receive multiple hardening fixes including a stack buffer overflow in the H.265 buffering period SEI parser, bounds checks in MPEG-TS PES header parsing, and a heap buffer overflow in MXF AES3 audio descriptor write_tags. The mxf and mpegtsdemux plugins receive numerous additional bounds and overflow fixes, and pngparse gets a use-after-free fix. Several memory leaks across decodebin2, subparse, samiparse, baseparse, and others are also addressed.

expat 2.8.1: This update jumps from 2.7.5 and addresses two security issues. A quadratic-runtime attack via attribute name collision checks is corrected, and the SipHash-based hash flooding protection now uses the full 16 bytes of salt instead of 4 to 8. The existing XML_SetHashSalt API is deprecated and a new XML_SetHashSalt16Bytes is introduced for callers that want to provide their own high-quality entropy.

rsync 3.4.3: A security-focused release fixing six CVEs in the file-synchronization tool. Three of the six (CVE-2026-29518, CVE-2026-43617, CVE-2026-43619) require non-default daemon configurations, two (CVE-2026-43618, CVE-2026-43620) are reachable from normal pulls or normal authenticated daemon connections, and the sixth (CVE-2026-45232) requires RSYNC_PROXY to be set with a pathological proxy response. Detailed CVE notes appear in the security section below. The release also adds defence-in-depth hardening on adjacent paths and fixes a regression introduced by the 3.4.0 secure_relative_open().

PostgreSQL 18.4: This point release of the database addresses 10 CVEs covering schema privilege checks, integer overflows in memory allocation calculations, time-zone name handling, path traversal in pg_basebackup and pg_rewind, subscription-name quoting in pg_createsubscriber, marking PQfn() as unsafe, timing-safe string comparisons in authentication, recursion limits in startup packet processing, MCV statistics validation, SQL injection protection in contrib/spi, and quoting of object names in logical replication origin checks. See the official 18.4 release announcement for full notes.

dnsmasq 2.92rel2: A security-focused point release fixing six CVEs in the DNS and DHCP server. Vulnerabilities include cache poisoning that could enable DoS or attacker redirection, DNSSEC validation flaws, a heap out-of-bounds read in DNSSEC validation, a heap out-of-bounds write in DHCPv6 handling, an information disclosure flaw allowing source-check bypass, and a buffer overflow in extract_addresses().

ImageMagick 7.1.2.23 and 7.1.2.24: The 7.1.2.24 version strengthens input validation by rejecting MTV, TGA, Cineon, and Farbfeld image files with zero columns or rows, preventing potential crashes or undefined behavior from malformed files. A new profile fuzzer is added for raw EXIF, XMP, IPTC, and ICC parsing to improve robustness. The 7.1.2.23 version rolls up many GitHub security advisories from upstream and applies an integer overflow fix tracked as CVE-2026-31853.

OpenEXR 3.4.11: A double update from 3.4.9 through 3.4.10 to 3.4.11 closes several additional CVEs in the EXR image format library. Fixes address a shift exponent overflow in readVariableLengthInteger(), an out-of-bounds read in IDManifest::init() during prefix expansion, an integer overflow in ImageChannel::resize, a signed integer overflow in ht_undo_impl() in the HTJ2K decoder, and two missed variants of the earlier DWA-decoder pointer arithmetic overflow.

ncurses 6.6.20260516: Two snapshot patches bring loop limit corrections in lib_twait.c, magic-cookie initialization deferral, terminal database refinements for kitty, contour, screen4/screen5, xterm-utf8, and warp, and a recur_wgetnstr() buffer limit correction.

hplip 3.26.4: A new release of the HP Linux Imaging and Printing project adds support for a broad range of new printers including the HP LaserJet Pro MFP 3106sdw/3105sdw, OfficeJet Pro 9730/9720/8130/8120 series, Envy 6500 series, and several DeskJet Ink Advantage models.

Vulkan SDK 1.4.350: Both vulkan-loader and vulkan-tools jump from 1.4.341 to 1.4.350. vulkaninfo now enables the device groups extension and checks extensions before querying properties, and a wrong extension being used for GGP is corrected.

Security Updates

net-tools 3.14~alpha:

• CVE-2024-58251: Fixes a flaw in netstat where a local user could launch a network application and cause a denial of service by locking up the terminal of a victim viewing netstat output.

curl 8.20.0:

• CVE-2026-4873: Addresses a flaw where a connection requiring TLS could incorrectly reuse an existing unencrypted IMAP, POP3, or SMTP connection from the pool and cause the subsequent data to be transmitted in clear-text.

• CVE-2026-5545: Resolves a vulnerability where HTTP Negotiate connections could be wrongly reused and potentially lead to authentication bypass.

• CVE-2026-5773: Fixes a flaw where SMB connections could be reused for transfers to a different share on the same server and potentially lead to the wrong file being downloaded or uploaded.

• CVE-2026-6253: Addresses a credential leak where proxy credentials could be exposed across a redirect to a different proxy.

• CVE-2026-6276: Resolves a cookie leak caused by stale custom cookie host handling on subsequent requests.

• CVE-2026-6429: Fixes a .netrc credential leak when a proxy connection was reused across requests.

update-alternatives 1.22.22:

• CVE-2026-2219: Addresses a flaw that could result in denial of service via an infinite CPU-spinning loop.

GnuTLS 3.8.13:

• CVE-2026-33845: Resolves an integer underflow that could lead to an out-of-bounds read and potential denial of service or information disclosure.

• CVE-2026-42009: Fixes a flaw potentially triggering undefined behavior.

• CVE-2026-33846: Addresses a heap buffer overflow that may allow remote denial of service or memory corruption.

• CVE-2026-42010: Resolves an authentication bypass in servers configured with RSA-PSK where usernames containing NUL characters wrongly matched ones truncated at the NUL.

• CVE-2026-3833: Fixes a name-constraint bypass that could cause certificates that should be rejected to be accepted.

mariadb 11.8.6:

• CVE-2026-32710: Addresses a heap-based buffer overflow that allows an authenticated user to crash the server and potentially achieve remote code execution.

krb5:

• CVE-2026-40355: Resolves a NULL pointer dereference that allowed an unauthenticated remote attacker to terminate the process when a NegoEx mechanism was registered.

• CVE-2026-40356: Fixes an integer underflow that could allow an unauthenticated remote attacker to trigger an out-of-bounds read of up to 52 bytes and potentially terminate the process.

libsndfile:

• CVE-2026-37555: Addresses an integer overflow that could lead to a heap buffer overflow or denial of service.

• CVE-2025-52194: Resolves a buffer overflow that could potentially lead to memory corruption or code execution.

qt6-svg:

• CVE-2026-6210: Fixes a type confusion and heap buffer overflow that results in an application crash.

tar:

• CVE-2025-45582: Addresses a directory traversal flaw that allows file overwrite bypassing the standard ../ protection.

Apache HTTP Server 2.4.67:

• CVE-2026-34059: Fixes a heap over-read and memory disclosure in mod_proxy_ajp in ajp_parse_data().

• CVE-2026-34032: Addresses a heap buffer over-read in ajp_msg_get_string() due to a missing null-termination check.

• CVE-2026-33857: Resolves an off-by-one out-of-bounds read in AJP getter functions.

• CVE-2026-33523: Patches an HTTP response splitting vulnerability across multiple modules when forwarding malicious status lines.

• CVE-2026-33007: Corrects a NULL pointer dereference in mod_authn_socache allowing an unauthenticated remote user to crash a child process in a caching forward proxy configuration.

• CVE-2026-33006: Resolves a timing attack against mod_auth_digest that allows a Digest authentication bypass.

• CVE-2026-29169: Fixes a NULL pointer dereference in mod_dav_lock allowing a server crash via a malicious request.

• CVE-2026-29168: Addresses unrestricted OCSP response handling in mod_md.

• CVE-2026-28780: Resolves a heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() where a malicious AJP server could write 4 attacker-controlled bytes past a heap buffer.

• CVE-2026-24072: Fixes an ap_expr privilege escalation in mod_rewrite allowing local .htaccess authors to read files with the privileges of the httpd user.

• CVE-2026-23918: Addresses a double free and possible RCE in HTTP/2 on early reset.

PHP 8.5.6:

• CVE-2026-7263: Fixes duplicate xmlns declarations from Dom\XMLDocument::C14N() after setAttributeNS().

• CVE-2026-6735: Resolves a XSS within the FPM status endpoint.

• CVE-2026-7259: Addresses a NULL pointer dereference in php_mb_check_encoding() via mb_ereg_search_init().

• CVE-2026-6104: Patches an out-of-bounds access in mbfl_name2encoding_ex().

• CVE-2025-14179: Fixes a SQL injection via NUL bytes in PDO_Firebird quoted strings.

• CVE-2026-6722: Addresses a stale SOAP_GLOBAL(ref_map) pointer with Apache Map.

• CVE-2026-7261: Resolves a use-after-free after SOAP header parsing failure with SOAP_PERSISTENCE_SESSION.

• CVE-2026-7262: Fixes a broken Apache map value NULL check.

• CVE-2026-7568: Addresses a signed integer overflow of a char array offset.

• CVE-2026-7258: Patches inconsistent passing of unsigned char to ctype.h functions.

• CVE-2026-42371: Fixes a numeric truncation in URI parsing carried by uriparser.

OpenEXR 3.4.11:

• CVE-2026-42217: Fixes a shift exponent overflow in readVariableLengthInteger().

• CVE-2026-42216: Addresses an out-of-bounds read in IDManifest::init() during prefix expansion.

• CVE-2026-41142: Resolves an integer overflow in ImageChannel::resize that leads to a heap out-of-bounds write via the OpenEXRUtil public API.

• CVE-2026-39886: Fixes an HTJ2K signed integer overflow in ht_undo_impl().

• CVE-2026-40244: Addresses an integer overflow in DWA setupChannelData planarUncRle pointer arithmetic.

• CVE-2026-40250: Resolves an integer overflow in the DWA decoder outBufferEnd pointer arithmetic.

rsync 3.4.3:

• CVE-2026-29518: Fixes a TOCTOU symlink race in daemon mode (use chroot = no) allowing local privilege escalation.

• CVE-2026-43617: Addresses an authorization bypass via hostname resolution when the daemon chroot tree lacks DNS resolution support, causing the connecting hostname to be set to UNKNOWN.

• CVE-2026-43618: Resolves an integer overflow in the compressed-token decoder enabling remote memory disclosure.

• CVE-2026-43619: Fixes symlink races on path-based system calls (chmod, lchown, utimes, rename, unlink, mkdir, symlink, mknod, link, rmdir, lstat) in use chroot = no daemon mode.

• CVE-2026-43620: Patches an out-of-bounds read in the receiver’s recv_files() allowing remote DoS of any client pulling from a malicious server.

• CVE-2026-45232: Addresses an off-by-one stack out-of-bounds write in establish_proxy_connection() HTTP CONNECT proxy response parsing.

PostgreSQL 18.4:

• CVE-2026-6472: Ensures the user has CREATE privilege on the schema specified.

• CVE-2026-6473: Fixes integer overflows in memory-allocation calculations.

• CVE-2026-6474: Guards against malicious time zone names.

• CVE-2026-6475: Prevents path traversal in pg_basebackup and pg_rewind.

• CVE-2026-6476: Properly quotes subscription names in pg_createsubscriber.

• CVE-2026-6477: Marks PQfn() as unsafe and avoids using it within libpq.

• CVE-2026-6478: Uses timing-safe string comparisons in authentication code.

• CVE-2026-6479: Prevents unbounded recursion while processing startup packets.

• CVE-2026-6575: Detects faulty input when restoring attribute MCV statistics.

• CVE-2026-6637: Prevents SQL injection and buffer overruns in contrib/spi.

• CVE-2026-6638: Properly quotes object names in logical replication origin checks.

dnsmasq 2.92rel2:

• CVE-2026-2291: Fixes cache poisoning that could enable DoS or attacker redirection.

• CVE-2026-4890: Addresses a DoS vulnerability in DNSSEC validation.

• CVE-2026-4891: Resolves a heap-based out-of-bounds read in DNSSEC validation.

• CVE-2026-4892: Patches a heap-based out-of-bounds write in the DHCPv6 implementation.

• CVE-2026-4893: Fixes an information disclosure flaw allowing source-check bypass.

• CVE-2026-5172: Addresses a buffer overflow in extract_addresses().

expat 2.8.1:

• CVE-2026-45186: Fixes a quadratic runtime from attribute name collision checks enabling DoS through moderately sized crafted XML input.

• CVE-2026-41080: Resolves limited hash flooding entropy by raising the hash salt size from 4-8 bytes to a full 16 bytes.

GraphicsMagick:

• CVE-2026-42050: Fixes a stack buffer overflow in XTileImage.

ImageMagick 7.1.2.23:

• CVE-2026-31853: Addresses an overflow check flaw.

Linux Kernel 7.0.7:

• CVE-2026-43349: Resolves a use-after-uninitialized-value access in f2fs.

• CVE-2026-43350: Addresses an SMB client flaw requiring a full NFS-mode SID before continuing.

• CVE-2026-43348: Fixes a vmemmap_shift exceeding MAX_FOLIO_* in mshv_vtl.

• CVE-2026-43490: Validates inherited ACE SID length in ksmbd.

glibc:

• CVE-2026-5928: Fixes ungetwc operating on a byte stream.

• CVE-2026-5450: Addresses a buffer overflow in scanf %mc.

libzypp 17.38.9:

• CVE-2026-44933: Prevents configured scripts from escaping the sigcheck directory.

python-Twisted 26.4.0:

• CVE-2026-42304: Prevents a DoS attack via resource exhaustion during DNS name decompression.

bind 9.20.23:

• CVE-2026-3592: Fixes an amplification vulnerability that could be made to consume disproportionate resources.

• CVE-2026-3039: Addresses excessive memory consumption when processing maliciously-constructed packets.

• CVE-2026-5950: Resolves a flaw exhausting CPU and memory.

• CVE-2026-5947: Fixes a race condition that could allow an unauthenticated remote attacker to crash the server.

• CVE-2026-5946: Addresses multiple flaws that could cause assertion failures via recursion, UPDATE, or NOTIFY paths.

python-idna 3.15:

• CVE-2026-45409: Closes a bypass of the CVE-2024-3651 mitigation by rejecting oversize inputs up-front.

python-urllib3 2.7.0:

• CVE-2026-44432: Closes a decompression-bomb safeguard bypass in the streaming API.

• CVE-2026-44431: Fixes HTTP pools created via ProxyManager.connection_from_url not stripping sensitive headers when redirecting to a different host.

perl-libwww-perl 6.83:

• CVE-2026-8368: Strips Authorization and Proxy-Authorization headers on cross-origin redirects to prevent credential leakage.

perl-CryptX 0.89:

• CVE-2026-41564: Patches a security flaw in the Perl interface to LibTomCrypt.

perl-Net-CIDR-Lite 0.24:

• CVE-2026-45190: Rejects Unicode digits and trailing newlines in parser inputs.

• CVE-2026-45191: Rejects zero-padded CIDR masks.

• CVE-2026-40199: Fixes an IPv4-mapped IPv6 packed length flaw.

• CVE-2026-40198: Rejects invalid uncompressed IPv6 addresses.

perl-XML-LibXML 2.0212:

• CVE-2026-8177: Prevents an out-of-bounds UTF-8 read in domParseChar by replacing it with libxml2’s xmlValidateName.

hplip 3.26.4:

• CVE-2026-8631: Fixes a flaw in the HP Linux Imaging and Printing stack.

• CVE-2026-8632: Addresses a second related flaw.

xen 4.21.1_06:

• CVE-2025-54518: Mitigates AMD-SN-7052 CPU Op Cache Corruption.

Users are advised to update to the latest versions to mitigate these vulnerabilities.

Conclusion

May 2026 was a steady month for openSUSE Tumbleweed with point releases landing across all three major KDE stacks (KDE Gear 26.04.1, Frameworks 6.26.0, and Plasma 6.6.5). Mesa made the leap to 26.1 with the Vulkan 1.4 API, and AppArmor shipped its first 5.0 release. Sysadmins received headline updates across Apache HTTP Server 2.4.67, PostgreSQL 18.4, rsync 3.4.3, dnsmasq 2.92rel2, GnuPG 2.5.20, and expat 2.8.1 — almost all driven by CVE fixes. The Linux kernel progressed from 7.0.5 to 7.0.9 with broad subsystem hardening, and security was the dominant theme across PHP, OpenEXR, jq, ImageMagick, python-cryptography, python-urllib3, and a long tail of Perl networking modules.

Slowroll Arrivals

Please note that these updates also apply to Slowroll and arrive between an average of 5 to 10 days after being released in Tumbleweed snapshot. This monthly approach has been consistent for many months, ensuring stability and timely enhancements for users. Updated packages for Slowroll are regularly published in emails on openSUSE Factory mailing list.

Contributing to openSUSE Tumbleweed

Stay updated with the latest snapshots by subscribing to the openSUSE Factory mailing list. For those Tumbleweed users who want to contribute or want to engage with detailed technological discussions, subscribe to the openSUSE Factory mailing list . The openSUSE team encourages users to continue participating through bug reports, feature suggestions and discussions.

Your contributions and feedback make openSUSE Tumbleweed better with every update. Whether reporting bugs, suggesting features, or participating in community discussions, your involvement is highly valued.

Dear Tumbleweed users and hackers,

Week 22 seemed a bit less hectic than the previous one. AppArmor profiles are still being fixed left and right. We’re really sorry for all the trouble AppArmor 5.0 brought you. The number of reports on that topic is decreasing, which means the AppArmor maintainer has done a great job addressing the issues as they were reported. Let’s all give our appreciation to Christian for his dedication to the topic.

The release team managed to publish 5 snapshots (0521, 0523, 0524, 0525, and 0527) during this week, delivering the following changes:

• freerdp 3.26.0
• postfix 3.11.3
• Ruby 4.0.5
• Poppler 26.05.0
• libgit2 1.9.4
• hplip 3.26.4, See Martin’s mail regarding plugins and workarounds
• Qt 5.15.19
• Mozilla Firefox 151.0.1
• Linux kernel 7.0.10
• Agama 21 based installer to test: https://download.opensuse.org/tumbleweed/appliances/iso/agama-installer.x86_64-openSUSE.iso

The machinery is oiled, and updates are submitted frequently. Currently, we are preparing the implementation of these updates:

• Qt 6.11.1
• Mesa 26.1.1
• mariadb 11.8.7
• GNOME 50.2
• Rework of Python3 packaging (as a meta package instead of a provides of the default interpreter)
• gcc 16 as the system default compiler

This is a roundup of articles from the openSUSE community listed on planet.opensuse.org.

The community blog aggregates a list of the featured highlights below from May 22 to 27.

Blogs this week cover security vulnerabilities discovered and patched in qSnapper’s privileged D-Bus service, a new GSoC 2026 contributor joining the openSUSE Project, nightly syslog-ng container images now available based on Alma Linux, a new plasmoid Scrolling Clock for KDE Plasma 6, a tip for previewing Markdown in the Kate editor, the April 2026 Krita report, the Mobile Linux Hackday in České Budějovice, Agama 21 and more.

Here is a summary and links for each post:

Whaleshark Opens Knopje

Sébas announces that on June 19 he will open the next edition of Knopje with a 1.5-hour melodic techno set.

Krita April 2026 Report

The KDE Blog covers the April 2026 Krita monthly report, which announces the release of Krita 5.3.2 and 6.0.2 with two months’ worth of bug fixes and improvements including text tool enhancements, performance fixes, and an Android crash fix. The post also highlights upcoming features in development and improves wide-gamut color conversion.

Introducing Shared Canned Responses

The Open Build Service Blog introduces shared canned responses in OBS, expanding a feature that previously only allowed users to create personal canned responses under their own profiles. The update allows canned responses to now be shared across projects and packages, streamlining collaboration and communication in request workflows.

How to Install exeLearning 4.0 on Your Computer

The KDE Blog explains how to install exeLearning 4.0, a free and open-source tool for creating interactive digital educational resources. The post outlines the three available editions.

Scrolling Clock Widget: Plasmoids for Plasma 6 (29)

The KDE Blog presents Scrolling Clock, the 29th widget in their Plasma 6 plasmoid series, which displays an animated clock cycling through all digits for a unique and eye-catching desktop look. Users who enjoy the widget are encouraged to support the developer through ratings, comments, or donations on the KDE Store.

Previewing Markdown Files in the Kate Editor

Victorhck shares a quick tip for enabling live Markdown preview inside the KDE Kate editor by activating the “Document Preview” plugin. The author notes that HTML preview does not work the same way and recommends using a browser for that format instead.

Nightly syslog-ng Containers Based on Alma Linux

Peter Czanik announces that nightly syslog-ng container images based on Alma Linux are now available on Docker Hub. Previously only Debian-based images were provided, but this new Alma Linux offering is built from the latest syslog-ng git snapshot packages.

Accepted into Google Summer of Code 2026 with openSUSE!

Mario Marín announces on his GSoC 2026 blog that he has been accepted into Google Summer of Code 2026 to contribute to the openSUSE project under two mentors. Over 12 weeks, he will work on improving the obs-status-service, including better SVG visualizations, a Gitea bot for Pull Request build information, and an AI-assisted stretch goal using Log Detective to analyze failed builds. He will be posting weekly progress updates on his blog.

qSnapper: Various Security Issues in Privileged D-Bus Service (CVE-2026-41045 through CVE-2026-41049)

The SUSE Security Team blog discloses five CVEs found during a security review of qSnapper, a GUI frontend for the Btrfs snapshot manager snapper. All issues were addressed through coordinated disclosure with the upstream author and fixes were shipped in the qSnapper 1.3.3 released on May 26.

MobileLinux Hackday #1 in České Budějovice

The SUSE Community Blog reports that the first Mobile Linux Hackday held in České Budějovice had a bigger turnout than the well-established Prague series with regard to attendance and synergy. The Prague series had already built a strong following over seven monthly events and the new venue signals growing momentum and geographic expansion for the Mobile Linux hackday movement in Czechia.

How to Use Desktop Icons NG (DING) on openSUSE 16 GNOME

The Geeko Blog provides a fix for the Desktop Icons NG (DING) GNOME extension failing to work on openSUSE 16. The post includes the relevant error message from /var/log/messages to help users identify the problem.

Long-Term Support Doesn’t Mean What You Think

The KDE Blog summarizes a post by KDE developer Nate Graham clarifying that LTS releases promise extended maintenance and security patches, not bug-free software or guaranteed personal support. The post draws a clear distinction between free community LTS distributions and commercially supported products and suggests that Flatpak apps can help bridge the software freshness gap on stable systems.

Haruna 1.8 Released – New Version of This KDE Media Player

The KDE Blog announces the release of Haruna 1.8, an open-source video player built on libmpv with YouTube integration. Haruna continues to be a solid alternative to Dragon Player and Kaffeine within the KDE ecosystem.

Linux Saloon 202 | Early Edition

CubicleNate recaps episode 202 of the Linux Saloon podcast, covering Colin’s use of his Surface Go running Cosmic Desktop, the release of Ubuntu 26.04 LTS, and updates on the Framework Computer Laptop 13 Pro.

Linux Saloon 203 | News Flight Night

CubicleNate recaps episode 203 of the Linux Saloon podcast, during which attendees discuss Collin’s experience with stillOS, the value of operating system rollback features, and notable news including HP sponsoring the Linux Vendor Firmware Service and KDE receiving a significant investment.

Xe Driver Support and Discover Improvements – This Week in Plasma

The KDE Blog translates Nate Graham’s weekly Plasma development summary. A standout community contribution added support for monitoring modern Intel Xe GPUs in System Monitor and its widgets. Discover also received several improvements including safer Flatpak data deletion sending files to the trash, a reorganized front page with the Editor’s Choice section moved higher, and case-insensitive search on the Updates page.

Agama 21 Released

Victorhck summarizes the release of Agama 21. The network configuration interface was redesigned with a new form supporting bond and bridge connections in addition to Ethernet and Wi-Fi. A new boot option inst.remote=0 allows disabling remote installer access for improved security in sensitive environments.

Tumbleweed – Review of the Weeks 2026/21

Victorhck and Dominique Leuenberger’s blog recap week 21 with six snapshots. The releases shipped notable updates including AppArmor 5.0.0, KDE Plasma 6.6.5, Linux kernel 7.0.6 through 7.0.9, GStreamer 1.28.3, Ruby 4.0.4, and PostgreSQL 18.4. Upcoming pipeline changes include Agama 21, GCC 16 as the default system compiler, and a rework of Python 3 packaging.

Workshop: Agentic AI and Total Automation at Linux Center València

The KDE Blog announces a hands-on workshop on agentic AI and automation taking place on June 6 at Slimbook’s Linux Center in Paterna, Valencia. The event features sessions on building intelligent agent systems using OpenClaw, privacy-respecting automation with Hermes, and a practical pair-programming workshop on Slimbook One mini PCs.

View more blogs or learn to publish your own on planet.opensuse.org.

On 19th of June, I will open the next edition of Knopje with a 1.5h set of melodic techno. The event starts at 23:00 at GAS19 in Nijmegen. Of course, my friend Roi Koch will also play a set, alongside a number of other fine DJs. Get yourself a ticket.

For many years, the syslog-ng project provided container images based on Debian. Most of our users run syslog-ng on RHEL & compatibles, and have asked for an RPM-based container. So, nightly containers based on Alma Linux are now also available.

A while ago, I prepared a small test project to run syslog-ng in an Alma Linux container: https://www.syslog-ng.com/community/b/blog/posts/experimental-syslog-ng-container-image-based-on-alma-linux However, that was only an experiment which I never updated. Fast forward to today: nightly syslog-ng containers based on the latest syslog-ng git snapshot package builds are now available on the Docker Hub!

Read more at https://www.syslog-ng.com/community/b/blog/posts/nightly-syslog-ng-containers-based-on-alma-linux

I am extremely excited to announce that I have been selected to participate in Google Summer of Code (GSoC) 2026! I will be contributing to the openSUSE Project.

The Project: Enhancing openSUSE Git Workflow

During the next 12 weeks, I will be working on improving the obs-status-service. Under the mentorship of Daniel García Moreno (dgarcia) and Doug, my main objectives include:

• Improving Visualizations: Extending the Go tool to generate better SVG images with new CSS styles and making them interactive with JavaScript.
• Gitea Bot Integration: Implementing a new bot for Gitea that provides useful build information directly inside Pull Requests.
• AI Integration (Stretch Goal): Exploring the use of AI through Log Detective to analyze and assist with PRs that fail to build.

Moving Forward

Given the dynamic nature of the GSoC program and software development itself, it’s very likely that these initial goals will adapt and change slightly as the weeks go by.

I’m ready to learn, face new challenges, and contribute to the open-source community. Stay tuned, as I will be posting my weekly progress right here!

Table of Contents

• 1) Introduction
• 2) Overview of the qSnapper D-Bus Service
• 3) Security Issues
  • 3.1) Weak Polkit Authentication Check is Subject to Race Condition (CVE-2026-41045)
  • 3.2) Path Traversal via configName Parameter (CVE-2026-41046)
  • 3.3) Information Leak via “diff” Methods (CVE-2026-41047)
  • 3.4) Caching of Authentication allows Authentication Bypass (CVE-2026-41048, CVE-2026-41049)
  • 3.5) Defense-in-Depth Issues when Restoring Arbitrary Files
  • 3.6) Other Issues
• 4) Upstream Bugfixes
• 5) Disclosure Process
• 6) Timeline
• 7) References

1) Introduction

qSnapper is a GUI frontend for the snapper utility for managing Btrfs filesystem snapshots. In April we received a review request for qSnapper, because it contains a privileged D-Bus service and Polkit policies.

Normally, Btrfs snapshots can only be managed with root privileges. qSnapper aims to provide more user-friendly and fine-grained access to snapshot management features, based on a privileged daemon which utilizes D-Bus and Polkit. Our review of the service uncovered various security issues, which led to a longer coordinated disclosure to allow upstream to develop bugfixes, which are part of upstream release 1.3.3.

The full details of the security issues will be covered in the sections below. The original review was performed on qSnapper release 1.1.3. Since bigger upstream changes appeared in the meantime this report is based on qSnapper release 1.3.2, however.

2) Overview of the qSnapper D-Bus Service

The qSnapper project contains a daemon named qsnapper-dbus-service, which runs with full root privileges. The daemon provides the D-Bus interface “com.presire.qsnapper.Operations” on the system bus; some of its methods are provided to arbitrary users in the system without authentication, while the majority of them is protected by Polkit authentication checks. The implementation of the various D-Bus methods offered by the service is found in snapshotoperations.cpp. All of the security issues outlined below are located in this compilation unit.

3) Security Issues

3.1) Weak Polkit Authentication Check is Subject to Race Condition (CVE-2026-41045)

The SnapshotOperations::checkAuthorization() function uses Polkit’s UnixProcess subject in an unsafe way to authenticate clients. The code obtains the client’s PID from the active D-Bus connection, which leads to a race condition. At the time the Polkit daemon (polkitd) checks the provided PID, the process in question can already have been replaced by another, privileged process. This is a well-known class of Polkit authentication bypasses which was assigned CVE-2013-4288.

In effect this means that clients may be able to bypass all Polkit authentication checks performed by qSnapper, although the attack is somewhat complex and might need multiple attempts to succeed. There is nothing stopping a local attacker from doing that, however. In combination with the configuration path traversal in D-Bus methods like WriteSnapperConfig() described below, this can be used to achieve a full local root exploit.

To fix this, we suggested to use Polkit’s SystemBusName subject instead. With this subject, the D-Bus daemon obtains the client’s UID in a race-free fashion from the UNIX domain socket the client used to connect, and polkitd cannot be fooled by recycled PIDs.

3.2) Path Traversal via configName Parameter (CVE-2026-41046)

All the D-Bus methods accepting a configName parameter (that is nearly all of them) suffer from a path traversal vulnerability. This string parameter is directly passed to snapper::Snapper(), which is part of the libsnapper API, without checking its safety. libsnapper expects a basename here to look up a configuration file in /etc/snapper/configs. In the context of qSnapper this string can contain additional path components like ../../path/to/crafted.cfg. This allows clients to use arbitrary configuration files as input to libsnapper.

When looking at the writeSnapperConfig() D-Bus method, which requires admin authentication, this path traversal allows to write largely attacker-controlled data to arbitrary locations. Combined with the Polkit authentication bypass described earlier in section 3.1, this would allow for a full local root exploit.

In case of other D-Bus methods which use the “list-snapshots” Polkit action, the path traversal is also accessible to locally logged-in users without any authentication. Luckily the libsnapper configuration file format offers no features that lead to a trivial local root exploit in this context. The impact of the vulnerability can be any of the following, however:

• local Denial-of-Service (DoS): by pointing libsnapper to a special file like /dev/zero, the daemon will consume the maximum amount of memory and be killed by the kernel. By pointing libsnapper to a named FIFO special file, the daemon will block indefinitely.
• information leak from parsing of private files: by pointing libsnapper to a private file like /etc/shadow, libsnapper will parse the sensitive data from the file as configuration data. If any logging features are active and the logs can be accessed by unprivileged users, then private data from such a file might leak into the unprivileged context. We are not aware of such an information leak in default installations, however.
• by providing crafted configuration data further attacks can be carried out:
  • SUBVOLUME can be pointed to arbitrary mounts in the system. Luckily libsnapper is conservative in its file operations here, and quite strictly verifies the validity of this path; it verifies if it is really a mount point and is backed by the expected block device and file system etc.
  • ALLOW_USERS and ALLOW_GROUPS can be set to arbitrary users and groups, allowing them officially to control the Snapper configuration.
  • The SYNC_ACL setting causes libsnapper to apply ACL entries to the .snapshots directory of the volume path, granting the users and groups from ALLOW_USERS and ALLOW_GROUPS to access the snapshot data. Thus this is a major local information leak.

libsnapper is using different backends depending on the file system type. Different code is used for each backend, which means that the exploitability of some aspects of the vulnerability depends on which backend is used. On openSUSE only the Btrfs and LVM thin volume backends are compiled-in by default, which only offer little additional attack surface.

To fix the issue, we suggested to upstream to verify the configName parameter in all cases and reject it if any / or .. components are found in it.

3.3) Information Leak via “diff” Methods (CVE-2026-41047)

The Polkit action “list-snapshots” is allowed for locally logged-in users without authentication, and is used by multiple qSnapper D-Bus methods which are likely considered “read-only” operations not harmful to the system. In version 1.1.3 of qSnapper the following methods are relying on this Polkit action:

• ListSnapshots()
• GetFileChanges()
• GetFileDiffAndDetails()

In version 1.3.2 of qSnapper these additional methods are using the action:

• GetFileChangesBetween()
• GetFileDiffBetween()

These methods allow to obtain information about metadata changes of arbitrary files between snapshots or between snapshots and the live filesystem. The newer GetFileDiffBetween() method even offers full file content diff output. These are major local information leaks, since unprivileged users can get a diff e.g. of the /etc/shadow file between different system states, or changes from root’s home directory which could leak sensitive data like passwords or private keys.

To fix this, we suggested to upstream that all methods providing non-public information get restricted by auth_admin Polkit checks. Alternatively, a check could be implemented whether the files to be diffed are normally accessible to the caller by using checks similar to the access() system call; such an approach would likely be rather complex and error-prone, however.

3.4) Caching of Authentication allows Authentication Bypass (CVE-2026-41048, CVE-2026-41049)

In version 1.2.1 of qSnapper an m_authenticated flag was introduced to the daemon’s code, which caches authentication once a client has passed certain Polkit action authentication checks. This cached authentication is shared between the methods DeleteSnapshot(), RestoreFiles() and RestoreFilesDirect(). There are two issues with this approach:

• DeleteSnapshot() uses the “delete-snapshot” action, while the other methods use the “rollback-snapshot” action. If a caller can authenticate for “delete-snapshot” then it is also implicitly authenticated for “rollback-snapshot” and vice versa. This is not how Polkit is intended to be used. If a system administrator decides to relax the authentication requirement for “delete-snapshot”, then this automatically implies the “rollback-snapshot” action now, which are two very different impacts to the system. We assigned CVE-2026-41048 for this aspect of the issue.
• The implementation of the caching logic assumes that a single interactive client is talking to the daemon. In fact, arbitrary users can invoke these methods. If a legitimate client is authenticated for one of the affected actions once, then arbitrary other users like nobody are now also considered authenticated and Polkit will not be invoked anymore. This authentication bypass allows for a full local root exploit in the context of the RestoreFiles() methods, as outlined below in section 3.6. We assigned CVE-2026-41049 for this aspect of the issue.

We suggested to upstream to drop this form of authentication caching, or alternatively implement an authentication cache tied to each user and each Polkit action in question to avoid the issues.

3.5) Defense-in-Depth Issues when Restoring Arbitrary Files

This section discusses Defense-in-Depth issues which remain once all the more tangible issues discussed above are fixed. The restoreFiles() D-Bus method accepts arbitrary filePaths as parameter to be restored from a version found in a snapshot. Clients need to authenticate as an administrator to do this, so there is no direct attack surface. Let’s consider the path /var/lib/colord/mapping.db to be restored, however:

# On openSUSE Tumbleweed this directory is owned and writable by `colord`
$ ls -lh /var/lib/colord
drwxr-xr-x 3 colord colord 4.0K Mar 6 2024 .

At the time the qSnapper service performs the chown() system call, the colord service user can stage a symlink attack in the colord directory and cause arbitrary files in the system to receive colord ownership, allowing a colord to root exploit. A similar issue affects the copyRegularFile() function, where a file on the live file system is newly created.

This issue is hard to fix, given the many different file system situations that the restore operation can end up in. The basic algorithm to address the problem would need to use low-level system calls like openat(), fchown() and fstatat() to safely traverse file system paths and inspect any symbolic links on the way. Given the complexity of the bugfix and limited impact, we agreed with the upstream author that this fix does not need to be prepared during the coordinated disclosure period but can be developed in the open afterwards.

Given the amount of front-line security issues already found in qSnapper in the course of this review, we refrained from assigning a dedicated CVE for these Defense-in-Depth issues in this case.

3.6) Other Issues

This section covers a number of other issues that are not fully-fledged security issues, but still represent weaknesses or possible hardenings for the qSnapper implementation.

• the D-Bus method RestoreFiles() implements complex file operations to rollback changes of a file path to the state found in a snapshot. These file operations allow authenticated clients to achieve nearly arbitrary file operations:
  • recursive deletion of arbitrary paths
  • copy of arbitrary files to arbitrary locations
  • change of ownership of files to arbitrary users
  • change of the file mode to arbitrary values

  This is because the method is not verifying whether the claimed file exists in the snapshot in the first place and whether the filePaths contain any ../ directory components to escape the snapshot directory. While this method is protected by Polkit’s auth_admin setting, any D-Bus method should be written conservatively and in such a way that the intended purpose of the method cannot be bypassed. The very similar method RestoreFilesDirect() has the same issues and also contains a lot of duplicate code which should be merged with the other method’s code.

• the Quit() method can be called by anyone in the system without authentication. This is kind of a local DoS against an active qSnapper daemon in use by other users in the system.
• the logfile created in /var/log/qSnapper will be world-readable, which could leak sensitive information. For hardening purposes it could be made private to root.

4) Upstream Bugfixes

The upstream author closely followed our suggestions to fix the security issues described in this report. Version 1.3.3 of qSnapper contains the following bugfixes:

• commit a6caf538 addresses the following issues:
  • the Polkit UnixProcess subject is replaced by the SystemBusName subject to avoid the race condition during authentication (issue 3.1).
  • the configName parameter in all D-Bus methods is now carefully verified and rejected if it allows path traversal (issue 3.2).
  • the authentication caching is removed (issue 3.4).
  • the RestoreFiles methods reject path traversal attempts (see section 3.6).
• commit f375b74c addresses the following issues:
  • a new view-diff Polkit action is introduced to generate file diffs which requires auth_admin authentication to prevent information leaks (issue 3.3).
  • the unauthenticated Quit D-Bus method was dropped (see section 3.6).
  • log files are now created without world-readable bit (see section 3.6).

The more complex defense-in-depth issues outlined in section 3.5 will be addressed by upstream in the open at a later time.

5) Disclosure Process

Once we established contact with the upstream author, we had a very constructive discussion of the coordinated disclosure process. Upstream quickly acknowledged the issues, opted for coordinated disclosure and communicated a time schedule when bugfixes were expected to be available for review and when a bugfix release of qSnapper would be published. When we agreed on the final bugfixes in the middle of May, we agreed on choosing an earlier publication date than originally intended.

We want to thank the upstream author for handling this report in a very professional fashion and for greatly improving the security and robustness of qSnapper.

6) Timeline

7) References

• qSnapper GitHub repository
• qSnapper 1.3.3 bugfix release
• openSUSE review bug for qSnapper

Breaking New Ground: Mobile Linux Hackday #1 in České Budějovice Outperforms Prague! If you’ve been following the Mobile Linux journey in Czechia, you know we’ve built a fantastic routine in Prague. We have a really successful series behind us consisting of 7 monthly hackdays, always hosted at the Prague SUSE office. But when the stars […]

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