{"id":"CVE-2026-27456","aliases":["ALPINE-CVE-2026-27456","ALSA-2026:93461","AZL-81846","BELL-CVE-2026-27456","CLSA-2026-1782989143","DEBIAN-CVE-2026-27456","EUVD-2026-18864","GHSA-qq4x-vfq4-9h9g","JLSEC-2026-212","OESA-2026-2211","RHSA-2026:7180","RLSA-2026:93461","ROOT-OS-DEBIAN-11-CVE-2026-27456","ROOT-OS-DEBIAN-12-CVE-2026-27456","ROOT-OS-DEBIAN-13-CVE-2026-27456","ROOT-OS-UBUNTU-2204-CVE-2026-27456","ROOT-OS-UBUNTU-2404-CVE-2026-27456","SUSE-SU-2026:1962-1","SUSE-SU-2026:21727-1","SUSE-SU-2026:21742-1","SUSE-SU-2026:22260-1","SUSE-SU-2026:22332-1","SUSE-SU-2026:23250-1","SUSE-SU-2026:23255-1","SUSE-SU-2026:23861-1","SUSE-SU-2026:23870-1","SUSE-SU-2026:23884-1","SUSE-SU-2026:2485-1","SUSE-SU-2026:2492-1","SUSE-SU-2026:2653-1","SUSE-SU-2026:3684-1","SUSE-SU-2026:3685-1","SUSE-SU-2026:3812-1","SUSE-SU-2026:3813-1","SUSE-SU-2026:4296-1","UBUNTU-CVE-2026-27456","USN-8702-1","openSUSE-SU-2026:10736-1","openSUSE-SU-2026:21028-1","openSUSE-SU-2026:21905-1"],"status":"published","title":"util-linux: TOCTOU Race Condition in util-linux mount(8) - Loop Device Setup","description":"util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.","severity":{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00157,"percentile":0.04934,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-269","CWE-367","CWE-59"],"published":"2026-04-03T21:23:00Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Alpine:v3.22","package":"util-linux","fixed_in":["2.41.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"util-linux","fixed_in":["2.41.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"util-linux","fixed_in":["2.41.4-r0","2.42.3-r0"],"sources":["osv"]},{"ecosystem":"Azure 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Advisory","advisory","web","article","report"]},{"url":"https://github.com/util-linux/util-linux/commit/5e390467b26a3cf3fecc04e1a0d482dff3162fc4","tags":["x_refsource_MISC","Patch","fix","web","article"]},{"url":"https://github.com/util-linux/util-linux/releases/tag/v2.41.4","tags":["x_refsource_MISC","Product","web","article"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-27456","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:93461","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-13595","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-27456","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-53612","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-53613","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-53614","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-53615","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-76642","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-78408","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-78410","tags":["report"]},{"url":"https://bugzilla.redhat.com/2454956","tags":["report"]},{"url":"https://bugzilla.redhat.com/2494101","tags":["report"]},{"url":"https://bugzilla.redhat.com/2519646","tags":["report"]},{"url":"https://bugzilla.redhat.com/2519647","tags":["report"]},{"url":"https://bugzilla.redhat.com/2519648","tags":["report"]},{"url":"https://bugzilla.redhat.com/2521999","tags":["report"]},{"url":"https://bugzilla.redhat.com/2522497","tags":["report"]},{"url":"https://bugzilla.redhat.com/2522684","tags":["report"]},{"url":"https://bugzilla.redhat.com/2552551","tags":["report"]},{"url":"https://errata.almalinux.org/10/ALSA-2026-93461.html","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27456","tags":["web","advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-27456","tags":["advisory"]},{"url":"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1782989143.html","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-28085","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-14104","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3184","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27456.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-27456","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2211","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:7180","tags":["advisory"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-14104","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-3184","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_7180.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2419369","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-14104","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2442570","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-3184","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2454956","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-27456","tags":["advisory","report"]},{"url":"https://errata.rockylinux.org/RLSA-2026:93461","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2494101","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2519646","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2519647","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2519648","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2521999","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2522497","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2522684","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2552551","tags":["report"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20261962-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1261606","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-27456","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202621727-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202621742-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202622260-1/","tags":["advisory"]},{"url":"https://www.suse.co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TOCTOU Race Condition in util-linux mount(8) - Loop Device Setup","description":"util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.","status":"published","published":"2026-04-03T21:23:00.984Z","modified":"2026-04-06T15:42:35.774Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-59","CWE-269","CWE-367"],"updated_at":"2026-11-02T14:19:48.826324Z"}],"euvd":[{"id":"EUVD-2026-18864","description":"util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.","status":"published","published":"2026-04-03T21:23:00Z","modified":"2026-04-06T15:42:35Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T19:25:15.794407Z"}],"nvd":[{"id":"CVE-2026-27456","description":"util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.","status":"published","published":"2026-04-03T22:16:25.4Z","modified":"2026-07-24T22:10:00.14Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-59","CWE-269","CWE-367"],"updated_at":"2026-11-02T14:12:13.1424Z"}],"osv":[{"id":"ALPINE-CVE-2026-27456","description":"util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.","status":"published","published":"2026-04-03T22:16:25.4Z","modified":"2026-10-01T02:17:49.221174869Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:27:50.269992Z"},{"id":"BELL-CVE-2026-27456","status":"published","published":"2026-04-07T06:09:09.579559Z","modified":"2026-08-05T07:15:05.377224001Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:28:23.315185Z"},{"id":"CVE-2026-27456","title":"util-linux: TOCTOU Race Condition in util-linux mount(8) - Loop Device Setup","description":"util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.","status":"published","published":"2026-04-03T21:23:00.984Z","modified":"2026-11-02T10:41:48.058369574Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-269","CWE-367","CWE-59"],"updated_at":"2026-11-02T15:45:00.180685Z"},{"id":"DEBIAN-CVE-2026-27456","description":"util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.","status":"published","published":"2026-04-03T22:16:25.4Z","modified":"2026-10-01T03:03:07.897942274Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:53.877573Z"},{"id":"JLSEC-2026-212","description":"util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary `/usr/bin/mount` from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither `O_NOFOLLOW`, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an `/etc/fstab` entry with user,loop options whose path points to a directory where the attacker has write permission, and that `/usr/bin/mount` has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.","status":"published","published":"2026-04-27T17:15:17.489Z","modified":"2026-07-25T18:24:06.204200433Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:47:18.573531Z"},{"id":"OESA-2026-2211","title":"util-linux security update","description":"The util-linux package contains a random collection of files that implements some low-level basic linux utilities.\r\n\r\nSecurity Fix(es):\n\nutil-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.(CVE-2026-27456)","status":"published","published":"2026-05-09T11:11:11Z","modified":"2026-08-18T01:19:51.844188825Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:46.087701Z"},{"id":"RHSA-2026:7180","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-04-20T10:11:06Z","modified":"2026-10-15T10:26:01Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:53:22.928316Z"},{"id":"RLSA-2026:93461","title":"Important: util-linux security update","description":"The util-linux packages contain a large variety of low-level system utilities that are necessary for a Linux system to function. Among others, these include the fdisk configuration tool and the login program.\n\nSecurity Fix(es):\n\n* util-linux: TOCTOU in the mount program when setting up loop devices (CVE-2026-27456)\n\n* util-linux: util-linux: heap use-after-free in libblkid nested partition probing (CVE-2026-13595)\n\n* util-linux: TOCTOU in the mount program via ancestor directory swap on target path (CVE-2026-53613)\n\n* util-linux: util-linux: TOCTOU in the mount program when applying post-mount ownership/mode changes (CVE-2026-53612)\n\n* util-linux: util-linux: SUID mount(8) allows nosuid/noexec bypass via LIBMOUNT_FORCE_MOUNT2 (CVE-2026-53614)\n\n* util-linux: util-linux: failed external mount helper still runs privileged X-mount post-hooks (CVE-2026-76642)\n\n* util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority (CVE-2026-78408)\n\n* util-linux: util-linux: restricted bind mounts do not pin the source, allowing X-mount.owner/group/mode redirection (CVE-2026-78410)\n\n* util-linux: util-linux: Partition metadata compromise via integer overflow in DOS partition parser (CVE-2026-53615)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-11-03T12:10:03.560067Z","modified":"2026-11-03T12:30:03.478027736Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T13:02:16.068655Z"},{"id":"ROOT-OS-DEBIAN-11-CVE-2026-27456","title":"CVE-2026-27456 in util-linux - Patched by Root","description":"Root has patched CVE-2026-27456 in the util-linux package for Root:Debian:11. Multiple fixed versions available.","status":"published","published":"2026-10-20T10:42:53Z","modified":"2026-10-20T11:15:37.538205618Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:29.900552Z"},{"id":"ROOT-OS-DEBIAN-12-CVE-2026-27456","title":"CVE-2026-27456 in util-linux - Patched by Root","description":"Root has patched CVE-2026-27456 in the util-linux package for Root:Debian:12. Multiple fixed versions available.","status":"published","published":"2026-10-16T09:26:03Z","modified":"2026-10-16T10:15:05.428266657Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:31.773105Z"},{"id":"ROOT-OS-DEBIAN-13-CVE-2026-27456","title":"CVE-2026-27456 in util-linux - Patched by Root","description":"Root has patched CVE-2026-27456 in the util-linux package for Root:Debian:13. Multiple fixed versions available.","status":"withdrawn","published":"2026-08-04T07:03:19Z","modified":"2026-08-19T20:00:13.60338671Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:33.415244Z"},{"id":"ROOT-OS-UBUNTU-2204-CVE-2026-27456","title":"CVE-2026-27456 in rootio-util-linux - Patched by Root","description":"Root has patched CVE-2026-27456 in the rootio-util-linux package for Root:Ubuntu:22.04. Multiple fixed versions available.","status":"withdrawn","published":"2026-06-03T09:40:31Z","modified":"2026-10-08T13:00:07.334926077Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:35.272797Z"},{"id":"ROOT-OS-UBUNTU-2404-CVE-2026-27456","title":"CVE-2026-27456 in util-linux - Patched by Root","description":"Root has patched CVE-2026-27456 in the util-linux package for Root:Ubuntu:24.04. Multiple fixed versions available.","status":"withdrawn","published":"2026-08-19T12:59:25Z","modified":"2026-10-08T13:00:07.263304445Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:38.68316Z"},{"id":"UBUNTU-CVE-2026-27456","description":"util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.","status":"published","published":"2026-04-03T22:16:00Z","modified":"2026-10-17T12:58:49.775038032Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:08.726452Z"},{"id":"ALSA-2026:93461","title":"Important: util-linux security update","description":"The util-linux packages contain a large variety of low-level system utilities that are necessary for a Linux system to function. Among others, these include the fdisk configuration tool and the login program.  \n\nSecurity Fix(es):  \n\n  * util-linux: TOCTOU in the mount program when setting up loop devices (CVE-2026-27456)\n  * util-linux: util-linux: heap use-after-free in libblkid nested partition probing (CVE-2026-13595)\n  * util-linux: TOCTOU in the mount program via ancestor directory swap on target path (CVE-2026-53613)\n  * util-linux: util-linux: TOCTOU in the mount program when applying post-mount ownership/mode changes (CVE-2026-53612)\n  * util-linux: util-linux: SUID mount(8) allows nosuid/noexec bypass via LIBMOUNT_FORCE_MOUNT2 (CVE-2026-53614)\n  * util-linux: util-linux: failed external mount helper still runs privileged X-mount post-hooks (CVE-2026-76642)\n  * util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority (CVE-2026-78408)\n  * util-linux: util-linux: restricted bind mounts do not pin the source, allowing X-mount.owner/group/mode redirection (CVE-2026-78410)\n  * util-linux: util-linux: Partition metadata compromise via integer overflow in DOS partition parser (CVE-2026-53615)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-11-02T00:00:00Z","modified":"2026-11-02T10:30:02.100888253Z","updated_at":"2026-11-02T15:27:57.367731Z"},{"id":"AZL-81846","title":"CVE-2026-27456 affecting package util-linux for versions less than 2.40.2-4","description":"util-linux is a random collection of Linux utilities. Prior to version 2.41.4, a TOCTOU (Time-of-Check-Time-of-Use) vulnerability has been identified in the SUID binary /usr/bin/mount from util-linux. The mount binary, when setting up loop devices, validates the source file path with user privileges via fork() + setuid() + realpath(), but subsequently re-canonicalizes and opens it with root privileges (euid=0) without verifying that the path has not been replaced between both operations. Neither O_NOFOLLOW, nor inode comparison, nor post-open fstat() are employed. This allows a local unprivileged user to replace the source file with a symlink pointing to any root-owned file or device during the race window, causing the SUID binary to open and mount it as root. Exploitation requires an /etc/fstab entry with user,loop options whose path points to a directory where the attacker has write permission, and that /usr/bin/mount has the SUID bit set (the default configuration on virtually all Linux distributions). The impact is unauthorized read access to root-protected files and block devices, including backup images, disk volumes, and any file containing a valid filesystem. This issue has been patched in version 2.41.4.","status":"published","published":"2026-04-03T22:16:25Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:24.988217Z"},{"id":"CLSA-2026-1782989143","title":"util-linux: Fix of 4 CVEs","description":"- CVE-2026-27456: fix TOCTOU symlink race in SUID mount loop device setup\n  that allowed non-root users to access arbitrary root-owned files via\n  symlink swap between path resolution and open","status":"published","published":"2026-07-02T10:46:04Z","modified":"2026-10-26T09:31:13.078939221Z","updated_at":"2026-11-02T15:43:45.794021Z"},{"id":"openSUSE-SU-2026:10736-1","title":"libblkid-devel-2.42-1.1 on GA media","description":"These are all security issues fixed in the libblkid-devel-2.42-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-05-08T00:00:00Z","modified":"2026-05-09T07:46:50.275368Z","updated_at":"2026-11-02T16:58:38.415593Z"},{"id":"openSUSE-SU-2026:21028-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issue\n\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n","status":"published","published":"2026-06-22T14:34:40Z","modified":"2026-06-30T18:24:28.762656395Z","updated_at":"2026-11-02T16:58:41.885092Z"},{"id":"openSUSE-SU-2026:21905-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issues:\n\n- CVE-2026-13595: heap use-after-free in `libblkid` nested partition probing (bsc#1269583).\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n- CVE-2026-53612: local privilege escalation via TOCTOU in mount(8) hook_owner.c chmod/chown (bsc#1268886).\n- CVE-2026-53613: local privilege escalation via TOCTOU in mount(8) - Target Path Redirection (bsc#1268886).\n- CVE-2026-53614: local privilege escalation via LIBMOUNT_FORCE_MOUNT2 Environment Variable - nosuid/noexec\n  Bypass in SUID mount(8) (bsc#1268886).\n- CVE-2026-76642: failed external mount helper triggers privileged `X-mount` post-hooks, which enables local privilege\n  escalation (bsc#1278349).\n- CVE-2026-78408: `nsenter --join-cgroup` leaks root `cgroup` migration authority, which allows for migration or\n  termination of root processes (bsc#1278348).\n- CVE-2026-78410: restricted `bind` mounts do not pin the source, which allows for `X-mount.owner`/`group`/`mode`\n  redirection (bsc#1278347).\n\nChanges for util-linux:\n\n- lib/fileutils: add ul_openat_resolve() openat2 wrapper (bsc#1275441)\n- lib/fileutils: fix RESOLVE_NO_SYMLINKS fallback value\n- lib/fileutils: fix unused parameter warnings without SYS_openat2\n- libmount: add missing fileutils.h include to hook_idmap.c\n- libmount: add mnt_open_tree() helper for safe tree opening\n- libmount: pin source path with openat2() for restricted users\n (bsc#1275441, bsc#1278347, CVE-2026-78410)\n- libmount: restrict source path canonicalization for non-root\n users (bsc#1275441, bsc#1278347, CVE-2026-78410)\n- libmount: skip post-mount hooks after failed mount helper\n (bsc#1275441, bsc#1278349, CVE-2026-76642)\n- libmount: use USE_LIBMOUNT_MOUNTFD_SUPPORT for idmap hook\n- nsenter: close cgroup.procs fd after join to prevent authority\n leak (bsc#1275441, bsc#1278348, CVE-2026-78408)\n- nsenter, unshare: add O_CLOEXEC to all open() calls (bsc#1275441,\n bsc#1278348, CVE-2026-78408)\n- wall, write: sanitize hostname in banner header (bsc#1275441)\n- Add missing function. (bsc#1275441)\n- ipcutils: Prevent using uninitialized variable (bsc#1268886)\n- BREAKING CHANGE:\n Paths must always be canonicalized for unprivileged users to\n ensure safe target resolution. X-mount.nocanonicalize is ignored\n for them.\n- INCOMAPTIBLE CHANGE (linux \u003c 6.15):\n X-mount.subdir: The safe detached subdirectory is no more\n supported for unprivileged users for safety reasons.\n- liblastlog2: Wait on busy SQLite connections (bsc#1268886).\n- libmount: Fix subvolid buffer overflow in get_btrfs_fs_root\n (bsc#1268886).\n- libblkid: Fix use-after-free in nested partition probing\n (bsc#1269583, bsc#1268886, CVE-2026-13595)\n- libmount: fix SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy\n mount path (bsc#1268886, CVE-2026-53614, GHSA-67r7-8m5w-22wx).\n- fileutils: add ul_open_no_symlinks() needed by other patches\n (bsc#1268886).\n- libmount: add fd_target to context for TOCTOU race condition\n prevention (bsc#1268886, CVE-2026-53613, GHSA-8gj5-72r3-428g).\n- libmount: ignore X-mount.nocanonicalize for restricted users\n- libmount: use fd-based fchownat/chmod in hook_owner (bsc#1268886,\n CVE-2026-53612, GHSA-g8wm-75wr-g2vh).\n- libmount: restrict X-mount.subdir for non-root (bsc#1268886).\n- libmount: use fd_target in hook_idmap for move_mount()\n- libmount: add mount ID verification and man page TOCTOU note\n- loopdev: use openat2(RESOLVE_NO_SYMLINKS) for backing file\n (bsc#1268886#c2, bsc#1261606).\n- Ignore pam-config error that prevents update failure if common*\n pam configuration is not symlink to common-*-pc (bsc#1270219).\n","status":"published","published":"2026-09-22T07:23:43Z","modified":"2026-09-25T18:23:12.440484259Z","updated_at":"2026-11-02T16:58:42.426393Z"},{"id":"SUSE-SU-2026:1962-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issue\n\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n","status":"published","published":"2026-05-18T08:08:07Z","modified":"2026-05-19T08:45:12.087016249Z","updated_at":"2026-11-02T15:54:01.610851Z"},{"id":"SUSE-SU-2026:21727-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issue\n\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n","status":"published","published":"2026-05-21T11:18:17Z","modified":"2026-05-23T18:23:41.678036348Z","updated_at":"2026-11-02T15:54:02.654057Z"},{"id":"SUSE-SU-2026:21742-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issue\n\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n","status":"published","published":"2026-05-21T12:36:08Z","modified":"2026-05-23T18:23:40.415854389Z","updated_at":"2026-11-02T15:54:02.654057Z"},{"id":"SUSE-SU-2026:22260-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issue\n\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n","status":"published","published":"2026-06-22T14:28:56Z","modified":"2026-06-30T18:24:32.79827231Z","updated_at":"2026-11-02T15:54:02.654057Z"},{"id":"SUSE-SU-2026:22332-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issue\n\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n","status":"published","published":"2026-06-22T14:28:56Z","modified":"2026-07-02T18:24:11.583583053Z","updated_at":"2026-11-02T15:54:03.080707Z"},{"id":"SUSE-SU-2026:23250-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issues:\n\n- CVE-2026-13595: heap use-after-free read in `libblkid` nested partition probing (bsc#1269583).\n- CVE-2026-27456: TOCTOU race condition in the mount program when setting up loop devices (bsc#1261606).\n- Several security issues in releases prior to v2.42.2 and v2.41.5 (bsc#1268886).\n","status":"published","published":"2026-08-21T14:17:45Z","modified":"2026-08-27T18:23:11.796008266Z","updated_at":"2026-11-02T15:54:03.503431Z"},{"id":"SUSE-SU-2026:23255-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2026-13595: heap use-after-free read in `libblkid` nested partition probing (bsc#1269583).\n- CVE-2026-27456: TOCTOU race condition in the mount program when setting up loop devices (bsc#1261606).\n- Several security issues in releases prior to v2.42.2 and v2.41.5 (bsc#1268886).\n\nOther updates and bugfixes:\n\n- Ignore `pam-config` error that prevents update failure if `common*` pam configuration is not symlink to `common-*-pc`\n  (bsc#1270219).\n","status":"published","published":"2026-08-24T15:02:24Z","modified":"2026-08-31T18:23:07.993155547Z","updated_at":"2026-11-02T15:54:03.503431Z"},{"id":"SUSE-SU-2026:23861-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issues:\n\n- CVE-2026-13595: heap use-after-free in `libblkid` nested partition probing (bsc#1269583).\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n- CVE-2026-53612: local privilege escalation via TOCTOU in mount(8) hook_owner.c chmod/chown (bsc#1268886).\n- CVE-2026-53613: local privilege escalation via TOCTOU in mount(8) - Target Path Redirection (bsc#1268886).\n- CVE-2026-53614: local privilege escalation via LIBMOUNT_FORCE_MOUNT2 Environment Variable - nosuid/noexec\n  Bypass in SUID mount(8) (bsc#1268886).\n- CVE-2026-76642: failed external mount helper triggers privileged `X-mount` post-hooks, which enables local privilege\n  escalation (bsc#1278349).\n- CVE-2026-78408: `nsenter --join-cgroup` leaks root `cgroup` migration authority, which allows for migration or\n  termination of root processes (bsc#1278348).\n- CVE-2026-78410: restricted `bind` mounts do not pin the source, which allows for `X-mount.owner`/`group`/`mode`\n  redirection (bsc#1278347).\n\nChanges for util-linux:\n\n- lib/fileutils: add ul_openat_resolve() openat2 wrapper (bsc#1275441)\n- lib/fileutils: fix RESOLVE_NO_SYMLINKS fallback value\n- lib/fileutils: fix unused parameter warnings without SYS_openat2\n- libmount: add missing fileutils.h include to hook_idmap.c\n- libmount: add mnt_open_tree() helper for safe tree opening\n- libmount: pin source path with openat2() for restricted users\n (bsc#1275441, bsc#1278347, CVE-2026-78410)\n- libmount: restrict source path canonicalization for non-root\n users (bsc#1275441, bsc#1278347, CVE-2026-78410)\n- libmount: skip post-mount hooks after failed mount helper\n (bsc#1275441, bsc#1278349, CVE-2026-76642)\n- libmount: use USE_LIBMOUNT_MOUNTFD_SUPPORT for idmap hook\n- nsenter: close cgroup.procs fd after join to prevent authority\n leak (bsc#1275441, bsc#1278348, CVE-2026-78408)\n- nsenter, unshare: add O_CLOEXEC to all open() calls (bsc#1275441,\n bsc#1278348, CVE-2026-78408)\n- wall, write: sanitize hostname in banner header (bsc#1275441)\n- Add missing function. (bsc#1275441)\n- ipcutils: Prevent using uninitialized variable (bsc#1268886)\n- BREAKING CHANGE:\n Paths must always be canonicalized for unprivileged users to\n ensure safe target resolution. X-mount.nocanonicalize is ignored\n for them.\n- INCOMAPTIBLE CHANGE (linux \u003c 6.15):\n X-mount.subdir: The safe detached subdirectory is no more\n supported for unprivileged users for safety reasons.\n- liblastlog2: Wait on busy SQLite connections (bsc#1268886).\n- libmount: Fix subvolid buffer overflow in get_btrfs_fs_root\n (bsc#1268886).\n- libblkid: Fix use-after-free in nested partition probing\n (bsc#1269583, bsc#1268886, CVE-2026-13595)\n- libmount: fix SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy\n mount path (bsc#1268886, CVE-2026-53614, GHSA-67r7-8m5w-22wx).\n- fileutils: add ul_open_no_symlinks() needed by other patches\n (bsc#1268886).\n- libmount: add fd_target to context for TOCTOU race condition\n prevention (bsc#1268886, CVE-2026-53613, GHSA-8gj5-72r3-428g).\n- libmount: ignore X-mount.nocanonicalize for restricted users\n- libmount: use fd-based fchownat/chmod in hook_owner (bsc#1268886,\n CVE-2026-53612, GHSA-g8wm-75wr-g2vh).\n- libmount: restrict X-mount.subdir for non-root (bsc#1268886).\n- libmount: use fd_target in hook_idmap for move_mount()\n- libmount: add mount ID verification and man page TOCTOU note\n- loopdev: use openat2(RESOLVE_NO_SYMLINKS) for backing file\n (bsc#1268886#c2, bsc#1261606).\n- Ignore pam-config error that prevents update failure if common*\n pam configuration is not symlink to common-*-pc (bsc#1270219).\n","status":"published","published":"2026-09-22T07:23:33Z","modified":"2026-09-27T18:23:16.546288969Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:23870-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issues:\n\n- CVE-2026-13595: heap use-after-free in `libblkid` nested partition probing (bsc#1269583).\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n- CVE-2026-53612: local privilege escalation via TOCTOU in mount(8) hook_owner.c chmod/chown (bsc#1268886).\n- CVE-2026-53613: local privilege escalation via TOCTOU in mount(8) - Target Path Redirection (bsc#1268886).\n- CVE-2026-53614: local privilege escalation via LIBMOUNT_FORCE_MOUNT2 Environment Variable - nosuid/noexec\n  Bypass in SUID mount(8) (bsc#1268886).\n- CVE-2026-76642: failed external mount helper triggers privileged `X-mount` post-hooks, which enables local privilege\n  escalation (bsc#1278349).\n- CVE-2026-78408: `nsenter --join-cgroup` leaks root `cgroup` migration authority, which allows for migration or\n  termination of root processes (bsc#1278348).\n- CVE-2026-78410: restricted `bind` mounts do not pin the source, which allows for `X-mount.owner`/`group`/`mode`\n  redirection (bsc#1278347).\n\nChanges for util-linux:\n\n- lib/fileutils: add ul_openat_resolve() openat2 wrapper (bsc#1275441)\n- lib/fileutils: fix RESOLVE_NO_SYMLINKS fallback value\n- lib/fileutils: fix unused parameter warnings without SYS_openat2\n- libmount: add missing fileutils.h include to hook_idmap.c\n- libmount: add mnt_open_tree() helper for safe tree opening\n- libmount: pin source path with openat2() for restricted users\n (bsc#1275441, bsc#1278347, CVE-2026-78410)\n- libmount: restrict source path canonicalization for non-root\n users (bsc#1275441, bsc#1278347, CVE-2026-78410)\n- libmount: skip post-mount hooks after failed mount helper\n (bsc#1275441, bsc#1278349, CVE-2026-76642)\n- libmount: use USE_LIBMOUNT_MOUNTFD_SUPPORT for idmap hook\n- nsenter: close cgroup.procs fd after join to prevent authority\n leak (bsc#1275441, bsc#1278348, CVE-2026-78408)\n- nsenter, unshare: add O_CLOEXEC to all open() calls (bsc#1275441,\n bsc#1278348, CVE-2026-78408)\n- wall, write: sanitize hostname in banner header (bsc#1275441)\n- Add missing function. (bsc#1275441)\n- ipcutils: Prevent using uninitialized variable (bsc#1268886)\n- BREAKING CHANGE:\n Paths must always be canonicalized for unprivileged users to\n ensure safe target resolution. X-mount.nocanonicalize is ignored\n for them.\n- INCOMAPTIBLE CHANGE (linux \u003c 6.15):\n X-mount.subdir: The safe detached subdirectory is no more\n supported for unprivileged users for safety reasons.\n- liblastlog2: Wait on busy SQLite connections (bsc#1268886).\n- libmount: Fix subvolid buffer overflow in get_btrfs_fs_root\n (bsc#1268886).\n- libblkid: Fix use-after-free in nested partition probing\n (bsc#1269583, bsc#1268886, CVE-2026-13595)\n- libmount: fix SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy\n mount path (bsc#1268886, CVE-2026-53614, GHSA-67r7-8m5w-22wx).\n- fileutils: add ul_open_no_symlinks() needed by other patches\n (bsc#1268886).\n- libmount: add fd_target to context for TOCTOU race condition\n prevention (bsc#1268886, CVE-2026-53613, GHSA-8gj5-72r3-428g).\n- libmount: ignore X-mount.nocanonicalize for restricted users\n- libmount: use fd-based fchownat/chmod in hook_owner (bsc#1268886,\n CVE-2026-53612, GHSA-g8wm-75wr-g2vh).\n- libmount: restrict X-mount.subdir for non-root (bsc#1268886).\n- libmount: use fd_target in hook_idmap for move_mount()\n- libmount: add mount ID verification and man page TOCTOU note\n- loopdev: use openat2(RESOLVE_NO_SYMLINKS) for backing file\n (bsc#1268886#c2, bsc#1261606).\n- Ignore pam-config error that prevents update failure if common*\n pam configuration is not symlink to common-*-pc (bsc#1270219).\n","status":"published","published":"2026-09-22T07:23:33Z","modified":"2026-09-27T18:23:17.189268803Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:23884-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issues:\n\n- CVE-2026-13595: heap use-after-free in `libblkid` nested partition probing (bsc#1269583).\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n- CVE-2026-53612: local privilege escalation via TOCTOU in mount(8) hook_owner.c chmod/chown (bsc#1268886).\n- CVE-2026-53613: local privilege escalation via TOCTOU in mount(8) - Target Path Redirection (bsc#1268886).\n- CVE-2026-53614: local privilege escalation via LIBMOUNT_FORCE_MOUNT2 Environment Variable - nosuid/noexec\n  Bypass in SUID mount(8) (bsc#1268886).\n- CVE-2026-76642: failed external mount helper triggers privileged `X-mount` post-hooks, which enables local privilege\n  escalation (bsc#1278349).\n- CVE-2026-78408: `nsenter --join-cgroup` leaks root `cgroup` migration authority, which allows for migration or\n  termination of root processes (bsc#1278348).\n- CVE-2026-78410: restricted `bind` mounts do not pin the source, which allows for `X-mount.owner`/`group`/`mode`\n  redirection (bsc#1278347).\n\nChanges for util-linux:\n\n- lib/fileutils: add ul_openat_resolve() openat2 wrapper (bsc#1275441)\n- lib/fileutils: fix RESOLVE_NO_SYMLINKS fallback value\n- lib/fileutils: fix unused parameter warnings without SYS_openat2\n- libmount: add missing fileutils.h include to hook_idmap.c\n- libmount: add mnt_open_tree() helper for safe tree opening\n- libmount: pin source path with openat2() for restricted users\n (bsc#1275441, bsc#1278347, CVE-2026-78410)\n- libmount: restrict source path canonicalization for non-root\n users (bsc#1275441, bsc#1278347, CVE-2026-78410)\n- libmount: skip post-mount hooks after failed mount helper\n (bsc#1275441, bsc#1278349, CVE-2026-76642)\n- libmount: use USE_LIBMOUNT_MOUNTFD_SUPPORT for idmap hook\n- nsenter: close cgroup.procs fd after join to prevent authority\n leak (bsc#1275441, bsc#1278348, CVE-2026-78408)\n- nsenter, unshare: add O_CLOEXEC to all open() calls (bsc#1275441,\n bsc#1278348, CVE-2026-78408)\n- wall, write: sanitize hostname in banner header (bsc#1275441)\n- Add missing function. (bsc#1275441)\n- ipcutils: Prevent using uninitialized variable (bsc#1268886)\n- BREAKING CHANGE:\n Paths must always be canonicalized for unprivileged users to\n ensure safe target resolution. X-mount.nocanonicalize is ignored\n for them.\n- INCOMAPTIBLE CHANGE (linux \u003c 6.15):\n X-mount.subdir: The safe detached subdirectory is no more\n supported for unprivileged users for safety reasons.\n- liblastlog2: Wait on busy SQLite connections (bsc#1268886).\n- libmount: Fix subvolid buffer overflow in get_btrfs_fs_root\n (bsc#1268886).\n- libblkid: Fix use-after-free in nested partition probing\n (bsc#1269583, bsc#1268886, CVE-2026-13595)\n- libmount: fix SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy\n mount path (bsc#1268886, CVE-2026-53614, GHSA-67r7-8m5w-22wx).\n- fileutils: add ul_open_no_symlinks() needed by other patches\n (bsc#1268886).\n- libmount: add fd_target to context for TOCTOU race condition\n prevention (bsc#1268886, CVE-2026-53613, GHSA-8gj5-72r3-428g).\n- libmount: ignore X-mount.nocanonicalize for restricted users\n- libmount: use fd-based fchownat/chmod in hook_owner (bsc#1268886,\n CVE-2026-53612, GHSA-g8wm-75wr-g2vh).\n- libmount: restrict X-mount.subdir for non-root (bsc#1268886).\n- libmount: use fd_target in hook_idmap for move_mount()\n- libmount: add mount ID verification and man page TOCTOU note\n- loopdev: use openat2(RESOLVE_NO_SYMLINKS) for backing file\n (bsc#1268886#c2, bsc#1261606).\n- Ignore pam-config error that prevents update failure if common*\n pam configuration is not symlink to common-*-pc (bsc#1270219).\n","status":"published","published":"2026-09-22T07:23:33Z","modified":"2026-09-30T18:23:11.186542772Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:2485-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issue\n\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n","status":"published","published":"2026-06-22T12:06:36Z","modified":"2026-06-24T09:00:13.198758427Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:2492-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issue\n\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n","status":"published","published":"2026-06-22T14:35:48Z","modified":"2026-06-24T09:00:13.190306469Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:2653-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issue\n\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n","status":"published","published":"2026-06-26T12:22:43Z","modified":"2026-06-27T08:45:05.200031623Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:3684-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issues:\n\n- CVE-2026-13595: heap use-after-free read in `libblkid` nested partition probing (bsc#1269583).\n- CVE-2026-27456: TOCTOU race condition in the mount program when setting up loop devices (bsc#1261606).\n- Several security issues in releases prior to v2.42.2 and v2.41.5 (bsc#1268886).\n","status":"published","published":"2026-08-21T18:23:24Z","modified":"2026-08-26T18:23:32.822833883Z","updated_at":"2026-11-02T15:54:05.392906Z"},{"id":"SUSE-SU-2026:3685-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issues:\n\n- CVE-2026-13595: heap use-after-free read in `libblkid` nested partition probing (bsc#1269583).\n- CVE-2026-27456: TOCTOU race condition in the mount program when setting up loop devices (bsc#1261606).\n- Several security issues in releases prior to v2.42.2 and v2.41.5 (bsc#1268886).\n","status":"published","published":"2026-08-21T18:24:05Z","modified":"2026-08-26T18:23:32.827308353Z","updated_at":"2026-11-02T15:54:05.392906Z"},{"id":"SUSE-SU-2026:3812-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issues:\n\n- CVE-2026-13595: heap use-after-free read in `libblkid` nested partition probing (bsc#1269583).\n- CVE-2026-27456: TOCTOU race condition in the mount program when setting up loop devices (bsc#1261606).\n- Several security issues in releases prior to v2.42.2 and v2.41.5 (bsc#1268886).\n","status":"published","published":"2026-08-26T10:55:09Z","modified":"2026-08-31T18:23:10.115326071Z","updated_at":"2026-11-02T15:54:05.392906Z"},{"id":"SUSE-SU-2026:3813-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issues:\n\n- CVE-2026-13595: heap use-after-free read in `libblkid` nested partition probing (bsc#1269583).\n- CVE-2026-27456: TOCTOU race condition in the mount program when setting up loop devices (bsc#1261606).\n- Several security issues in releases prior to v2.42.2 and v2.41.5 (bsc#1268886).\n","status":"published","published":"2026-08-26T10:55:59Z","modified":"2026-08-31T18:23:10.244494367Z","updated_at":"2026-11-02T15:54:05.392906Z"},{"id":"SUSE-SU-2026:4296-1","title":"Security update for util-linux","description":"This update for util-linux fixes the following issues:\n\n- CVE-2026-13595: heap use-after-free in `libblkid` nested partition probing (bsc#1269583).\n- CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).\n- CVE-2026-53613: Local Privilege Escalation via TOCTOU in mount(8) — Target Path Redirection (bsc#1268886)\n","status":"published","published":"2026-09-23T07:56:50Z","modified":"2026-09-23T18:15:03.517663732Z","updated_at":"2026-11-02T15:54:05.838224Z"},{"id":"USN-8702-1","title":"util-linux vulnerabilities","description":"It was discovered that libblkid in util-linux had a heap use-after-free\nvulnerability during nested partition probing. An attacker who could\npresent a crafted block device image could possibly use this issue to\nobtain sensitive information or cause a denial of service. (CVE-2026-13595)\n\nIt was discovered that the mount utility in util-linux had a time-of-check-\ntime-of-use vulnerability when setting up loop devices. A local attacker\ncould possibly use this issue to obtain unauthorized read access to root-\nprotected files and block devices. (CVE-2026-27456)\n\nIt was discovered that the login utility in util-linux improperly\ncanonicalized hostnames when invoked with the -h option. A remote attacker\ncould possibly use this issue to bypass host-based access control rules.\nThis issue only affected Ubuntu 26.04 LTS. (CVE-2026-3184)\n\nIt was discovered that libmount in util-linux had a time-of-check-time-of-\nuse vulnerability in its ownership hook. A local attacker could possibly\nuse this issue to gain elevated privileges. This issue only affected Ubuntu\n24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-53612)\n\nIt was discovered that libmount in util-linux had a time-of-check-time-of-\nuse vulnerability that allowed target path redirection during mount\noperations. A local attacker could possibly use this issue to gain elevated\nprivileges. (CVE-2026-53613)\n\nIt was discovered that libmount in util-linux improperly handled the\nLIBMOUNT_FORCE_MOUNT2 environment variable in the SUID mount utility. A\nlocal attacker could possibly use this issue to bypass nosuid and noexec\nmount options and gain elevated privileges. This issue only affected Ubuntu\n24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-53614)\n\nIt was discovered that libblkid in util-linux had an integer overflow\nvulnerability when parsing DOS partition tables. An attacker who could\npresent a crafted block device image could possibly use this issue to cause\na denial of service. (CVE-2026-53615)","status":"published","published":"2026-08-31T12:39:05Z","modified":"2026-10-17T12:55:29.41236116Z","updated_at":"2026-11-02T16:58:26.907654Z"}]}}