SUSE alert SUSE-SU-2026:23884-1 (util-linux)

From:
             
 
SLE-SECURITY-UPDATES <null@suse.de>
To:
             
 
sle-security-updates@lists.suse.com
Subject:
             
 
SUSE-SU-2026:23884-1: important: Security update for util-linux
Date:
             
 
Tue, 29 Sep 2026 16:57:55 -0000
Message-ID:
             
 
<179070107587.11305.15123075618988896620@af273d3f1972>
# Security update for util-linux

Announcement ID: SUSE-SU-2026:23884-1  
Release Date: 2026-09-22T07:18:54Z  
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 Micro 6.2

  
  
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 Micro 6.2  
    zypper in -t patch SUSE-SL-Micro-6.2-1733

## Package List:

  * SUSE Linux Micro 6.2 (aarch64 ppc64le s390x x86_64)
    * util-linux-debugsource-2.41.1-160000.5.1
    * libsmartcols1-debuginfo-2.41.1-160000.5.1
    * lastlog2-2.41.1-160000.5.1
    * util-linux-systemd-debuginfo-2.41.1-160000.5.1
    * libblkid1-debuginfo-2.41.1-160000.5.1
    * libmount1-debuginfo-2.41.1-160000.5.1
    * libuuid1-debuginfo-2.41.1-160000.5.1
    * util-linux-systemd-debugsource-2.41.1-160000.5.1
    * libfdisk1-debuginfo-2.41.1-160000.5.1
    * libsmartcols1-2.41.1-160000.5.1
    * libfdisk1-2.41.1-160000.5.1
    * libmount1-2.41.1-160000.5.1
    * liblastlog2-2-2.41.1-160000.5.1
    * util-linux-systemd-2.41.1-160000.5.1
    * lastlog2-debuginfo-2.41.1-160000.5.1
    * libblkid1-2.41.1-160000.5.1
    * liblastlog2-2-debuginfo-2.41.1-160000.5.1
    * util-linux-2.41.1-160000.5.1
    * util-linux-debuginfo-2.41.1-160000.5.1
    * libuuid1-2.41.1-160000.5.1

## 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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