{"id":"CVE-2026-78408","aliases":["ALPINE-CVE-2026-78408","ALSA-2026:93461","AZL-99393","BELL-CVE-2026-78408","DEBIAN-CVE-2026-78408","EUVD-2026-70105","MGASA-2026-0560","RHSA-2026:63162","RLSA-2026:93461","ROOT-OS-DEBIAN-12-CVE-2026-78408","ROOT-OS-DEBIAN-13-CVE-2026-78408","SUSE-SU-2026:23861-1","SUSE-SU-2026:23870-1","SUSE-SU-2026:23884-1","UBUNTU-CVE-2026-78408","openSUSE-SU-2026:11870-1","openSUSE-SU-2026:21905-1"],"status":"published","title":"Util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority","description":"The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.","severity":{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00237,"percentile":0.14845,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-775"],"published":"2026-09-02T15:05:33Z","modified":"2026-11-09T12:52:32Z","fixes":[{"ecosystem":"Alpine:v3.22","package":"util-linux","fixed_in":["2.41.6-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"util-linux","fixed_in":["2.41.6-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"util-linux","fixed_in":["2.42.3-r1"],"sources":["osv"]},{"ecosystem":"Azure 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util-linux: nsenter --join-cgroup leaks root cgroup migration authority","description":"The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.","status":"published","published":"2026-09-02T15:05:33.555Z","modified":"2026-11-05T02:43:52.916Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-775"],"updated_at":"2026-11-05T06:56:15.67765Z"}],"euvd":[{"id":"EUVD-2026-70105","description":"The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.","status":"published","published":"2026-09-02T15:05:33Z","modified":"2026-11-05T02:43:52Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-05T06:54:34.509968Z"}],"nvd":[{"id":"CVE-2026-78408","description":"The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.","status":"published","published":"2026-09-02T16:17:23.687Z","modified":"2026-11-05T03:17:32.977Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-775"],"updated_at":"2026-11-05T06:56:39.603296Z"}],"osv":[{"id":"ALPINE-CVE-2026-78408","description":"The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.","status":"published","published":"2026-09-02T16:17:23.687Z","modified":"2026-10-01T02:17:49.410753483Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:50.764331Z"},{"id":"BELL-CVE-2026-78408","status":"published","published":"2026-09-05T06:06:14.919517Z","modified":"2026-10-02T07:15:05.198800739Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:26.041478Z"},{"id":"DEBIAN-CVE-2026-78408","description":"The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.","status":"published","published":"2026-09-02T16:17:23.687Z","modified":"2026-11-05T09:47:39.317163494Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-05T13:31:24.64316Z"},{"id":"RHSA-2026:63162","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-09-04T10:13:58Z","modified":"2026-10-17T10:17:14Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:21.91255Z"},{"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":"UBUNTU-CVE-2026-78408","description":"The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.","status":"published","published":"2026-09-02T16:17:00Z","modified":"2026-11-09T12:52:32.770149456Z","cvss":[{"version":"3.1","score":7.9,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-09T13:26:05.568602Z"},{"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-99393","title":"CVE-2026-78408 affecting package util-linux for versions less than 2.40.2-6","description":"The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.","status":"published","published":"2026-09-02T16:17:23Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:26.480138Z"},{"id":"MGASA-2026-0560","title":"Updated util-linux package fixes security vulnerabilities","description":"Additional fix for CVE-2024-28085.\nLocal Privilege Escalation via TOCTOU in mount(8) hook_owner.c\nchmod/chown. (CVE-2026-53612)\nLocal Privilege Escalation via TOCTOU in mount(8) — Target Path\nRedirection. (CVE-2026-53613)\nLocal Privilege Escalation via LIBMOUNT_FORCE_MOUNT2 Environment\nVariable — nosuid/noexec Bypass in SUID mount(8). (CVE-2026-53614)\nmount(8) post-mount hooks execute after helper failure. (CVE-2026-76642)\nnsenter(1), unshare(1) file descriptor leak. (CVE-2026-78408)\nmount(8) X-mount.subdir symlink escape. (CVE-2026-78409)\nmount(8) TOCTOU race on source path. (CVE-2026-78410)\n","status":"published","published":"2026-10-27T20:02:56Z","modified":"2026-10-27T20:15:03.204676304Z","updated_at":"2026-11-02T15:49:43.795591Z"},{"id":"openSUSE-SU-2026:11870-1","title":"libblkid-devel-2.42.3-1.1 on GA media","description":"These are all security issues fixed in the libblkid-devel-2.42.3-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-09-23T00:00:00Z","modified":"2026-09-24T18:23:15.542670035Z","updated_at":"2026-11-02T16:58:40.245664Z"},{"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":"ROOT-OS-DEBIAN-12-CVE-2026-78408","title":"CVE-2026-78408 in util-linux - Patched by Root","description":"Root has patched CVE-2026-78408 in the util-linux package for Root:Debian:12. Multiple fixed versions available.","status":"published","published":"2026-10-16T09:26:03Z","modified":"2026-10-16T10:15:02.556707976Z","updated_at":"2026-11-02T15:53:32.570806Z"},{"id":"ROOT-OS-DEBIAN-13-CVE-2026-78408","title":"CVE-2026-78408 in util-linux - Patched by Root","description":"Root has patched CVE-2026-78408 in the util-linux package for Root:Debian:13. Multiple fixed versions available.","status":"published","published":"2026-10-16T09:34:01Z","modified":"2026-10-16T10:15:05.997082046Z","updated_at":"2026-11-02T15:53:33.681527Z"},{"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"}]}}