SUSE-SU-2026:23861-1: important: Security update for util-linux
SLE-UPDATES
null at suse.de
Thu Sep 24 20:37:46 UTC 2026
# Security update for util-linux
Announcement ID: SUSE-SU-2026:23861-1
Release Date: 2026-09-22T07:23:43Z
Rating: important
References:
* bsc#1261606
* bsc#1268886
* bsc#1269583
* bsc#1270219
* bsc#1275441
* bsc#1278347
* bsc#1278348
* bsc#1278349
Cross-References:
* CVE-2026-13595
* CVE-2026-27456
* CVE-2026-53612
* CVE-2026-53613
* CVE-2026-53614
* CVE-2026-76642
* CVE-2026-78408
* CVE-2026-78410
CVSS scores:
* CVE-2026-13595 ( SUSE ): 6.9
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
* CVE-2026-13595 ( SUSE ): 6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
* CVE-2026-13595 ( NVD ): 6.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
* CVE-2026-13595 ( NVD ): 5.3 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
* CVE-2026-27456 ( SUSE ): 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
* CVE-2026-27456 ( NVD ): 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
* CVE-2026-53612 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
* CVE-2026-53613 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
* CVE-2026-53614 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
* CVE-2026-76642 ( SUSE ): 8.5
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
* CVE-2026-76642 ( SUSE ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
* CVE-2026-76642 ( NVD ): 8.5
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
* CVE-2026-76642 ( NVD ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
* CVE-2026-78408 ( SUSE ): 5.2
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
* CVE-2026-78408 ( SUSE ): 6.6 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H
* CVE-2026-78408 ( NVD ): 7.9 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H
* CVE-2026-78410 ( SUSE ): 8.5
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
* CVE-2026-78410 ( SUSE ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
* CVE-2026-78410 ( NVD ): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Products:
* SUSE Linux Enterprise Server 16.0
An update that solves eight vulnerabilities can now be installed.
## Description:
This update for util-linux fixes the following issues:
* CVE-2026-13595: heap use-after-free in `libblkid` nested partition probing
(bsc#1269583).
* CVE-2026-27456: TOCTOU in the mount program when setting up loop devices
(bsc#1261606).
* CVE-2026-53612: local privilege escalation via TOCTOU in mount(8)
hook_owner.c chmod/chown (bsc#1268886).
* CVE-2026-53613: local privilege escalation via TOCTOU in mount(8) - Target
Path Redirection (bsc#1268886).
* CVE-2026-53614: local privilege escalation via LIBMOUNT_FORCE_MOUNT2
Environment Variable - nosuid/noexec Bypass in SUID mount(8) (bsc#1268886).
* CVE-2026-76642: failed external mount helper triggers privileged `X-mount`
post-hooks, which enables local privilege escalation (bsc#1278349).
* CVE-2026-78408: `nsenter --join-cgroup` leaks root `cgroup` migration
authority, which allows for migration or termination of root processes
(bsc#1278348).
* CVE-2026-78410: restricted `bind` mounts do not pin the source, which allows
for `X-mount.owner`/`group`/`mode` redirection (bsc#1278347).
Changes for util-linux:
* lib/fileutils: add ul_openat_resolve() openat2 wrapper (bsc#1275441)
* lib/fileutils: fix RESOLVE_NO_SYMLINKS fallback value
* lib/fileutils: fix unused parameter warnings without SYS_openat2
* libmount: add missing fileutils.h include to hook_idmap.c
* libmount: add mnt_open_tree() helper for safe tree opening
* libmount: pin source path with openat2() for restricted users (bsc#1275441,
bsc#1278347, CVE-2026-78410)
* libmount: restrict source path canonicalization for non-root users
(bsc#1275441, bsc#1278347, CVE-2026-78410)
* libmount: skip post-mount hooks after failed mount helper (bsc#1275441,
bsc#1278349, CVE-2026-76642)
* libmount: use USE_LIBMOUNT_MOUNTFD_SUPPORT for idmap hook
* nsenter: close cgroup.procs fd after join to prevent authority leak
(bsc#1275441, bsc#1278348, CVE-2026-78408)
* nsenter, unshare: add O_CLOEXEC to all open() calls (bsc#1275441,
bsc#1278348, CVE-2026-78408)
* wall, write: sanitize hostname in banner header (bsc#1275441)
* Add missing function. (bsc#1275441)
* ipcutils: Prevent using uninitialized variable (bsc#1268886)
* BREAKING CHANGE: Paths must always be canonicalized for unprivileged users
to ensure safe target resolution. X-mount.nocanonicalize is ignored for
them.
* INCOMAPTIBLE CHANGE (linux < 6.15): X-mount.subdir: The safe detached
subdirectory is no more supported for unprivileged users for safety reasons.
* liblastlog2: Wait on busy SQLite connections (bsc#1268886).
* libmount: Fix subvolid buffer overflow in get_btrfs_fs_root (bsc#1268886).
* libblkid: Fix use-after-free in nested partition probing (bsc#1269583,
bsc#1268886, CVE-2026-13595)
* libmount: fix SUID bypass via LIBMOUNT_FORCE_MOUNT2 and legacy mount path
(bsc#1268886, CVE-2026-53614, GHSA-67r7-8m5w-22wx).
* fileutils: add ul_open_no_symlinks() needed by other patches (bsc#1268886).
* libmount: add fd_target to context for TOCTOU race condition prevention
(bsc#1268886, CVE-2026-53613, GHSA-8gj5-72r3-428g).
* libmount: ignore X-mount.nocanonicalize for restricted users
* libmount: use fd-based fchownat/chmod in hook_owner (bsc#1268886,
CVE-2026-53612, GHSA-g8wm-75wr-g2vh).
* libmount: restrict X-mount.subdir for non-root (bsc#1268886).
* libmount: use fd_target in hook_idmap for move_mount()
* libmount: add mount ID verification and man page TOCTOU note
* loopdev: use openat2(RESOLVE_NO_SYMLINKS) for backing file (bsc#1268886#c2,
bsc#1261606).
* Ignore pam-config error that prevents update failure if common _pam
configuration is not symlink to common-_ -pc (bsc#1270219).
## Patch Instructions:
To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".
Alternatively you can run the command listed for your product:
* SUSE Linux Enterprise Server 16.0
zypper in -t patch SUSE-SLES-16.0-1733
## Package List:
* SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
* libblkid-devel-static-2.41.1-160000.5.1
* liblastlog2-devel-2.41.1-160000.5.1
* libsmartcols-devel-static-2.41.1-160000.5.1
* libuuid1-debuginfo-2.41.1-160000.5.1
* util-linux-tty-tools-2.41.1-160000.5.1
* util-linux-2.41.1-160000.5.1
* libsmartcols1-2.41.1-160000.5.1
* util-linux-systemd-debugsource-2.41.1-160000.5.1
* python313-libmount-debuginfo-2.41.1-160000.5.1
* python-libmount-debugsource-2.41.1-160000.5.1
* liblastlog2-2-2.41.1-160000.5.1
* libfdisk-devel-static-2.41.1-160000.5.1
* libsmartcols-devel-2.41.1-160000.5.1
* python313-libmount-2.41.1-160000.5.1
* util-linux-systemd-2.41.1-160000.5.1
* libfdisk1-2.41.1-160000.5.1
* liblastlog2-2-debuginfo-2.41.1-160000.5.1
* libuuid-devel-2.41.1-160000.5.1
* lastlog2-debuginfo-2.41.1-160000.5.1
* libmount1-2.41.1-160000.5.1
* libmount1-debuginfo-2.41.1-160000.5.1
* libuuid-devel-static-2.41.1-160000.5.1
* libfdisk-devel-2.41.1-160000.5.1
* util-linux-debuginfo-2.41.1-160000.5.1
* libblkid-devel-2.41.1-160000.5.1
* libblkid1-debuginfo-2.41.1-160000.5.1
* uuidd-debuginfo-2.41.1-160000.5.1
* libmount-devel-static-2.41.1-160000.5.1
* libsmartcols1-debuginfo-2.41.1-160000.5.1
* lastlog2-2.41.1-160000.5.1
* util-linux-tty-tools-debuginfo-2.41.1-160000.5.1
* libmount-devel-2.41.1-160000.5.1
* util-linux-debugsource-2.41.1-160000.5.1
* libfdisk1-debuginfo-2.41.1-160000.5.1
* libblkid1-2.41.1-160000.5.1
* libuuid1-2.41.1-160000.5.1
* util-linux-systemd-debuginfo-2.41.1-160000.5.1
* uuidd-2.41.1-160000.5.1
* SUSE Linux Enterprise Server 16.0 (noarch)
* util-linux-lang-2.41.1-160000.5.1
## References:
* https://www.suse.com/security/cve/CVE-2026-13595.html
* https://www.suse.com/security/cve/CVE-2026-27456.html
* https://www.suse.com/security/cve/CVE-2026-53612.html
* https://www.suse.com/security/cve/CVE-2026-53613.html
* https://www.suse.com/security/cve/CVE-2026-53614.html
* https://www.suse.com/security/cve/CVE-2026-76642.html
* https://www.suse.com/security/cve/CVE-2026-78408.html
* https://www.suse.com/security/cve/CVE-2026-78410.html
* https://bugzilla.suse.com/show_bug.cgi?id=1261606
* https://bugzilla.suse.com/show_bug.cgi?id=1268886
* https://bugzilla.suse.com/show_bug.cgi?id=1269583
* https://bugzilla.suse.com/show_bug.cgi?id=1270219
* https://bugzilla.suse.com/show_bug.cgi?id=1275441
* https://bugzilla.suse.com/show_bug.cgi?id=1278347
* https://bugzilla.suse.com/show_bug.cgi?id=1278348
* https://bugzilla.suse.com/show_bug.cgi?id=1278349
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