Time-of-check Time-of-use (TOCTOU) Affecting util-linux-tty-tools package, versions <2.40.4-150700.4.13.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.12% (2nd percentile)

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  • Snyk IDSNYK-SLES157-UTILLINUXTTYTOOLS-17420599
  • published23 Jun 2026
  • disclosed22 Jun 2026

Introduced: 22 Jun 2026

CVE-2026-27456  (opens in a new tab)
CWE-367  (opens in a new tab)

How to fix?

Upgrade SLES:15.7 util-linux-tty-tools to version 2.40.4-150700.4.13.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream util-linux-tty-tools package and not the util-linux-tty-tools package as distributed by SLES. See How to fix? for SLES:15.7 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1