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SUSE-SU-2026:2492-1

Опубликовано: 22 июн. 2026
Источник: suse-cvrf

Описание

Security update for util-linux

This update for util-linux fixes the following issue

  • CVE-2026-27456: TOCTOU in the mount program when setting up loop devices (bsc#1261606).

Список пакетов

Image SLES12-SP5-Azure-HPC-BYOS
libblkid1-2.33.2-4.54.1
libfdisk1-2.33.2-4.54.1
libmount1-2.33.2-4.54.1
libsmartcols1-2.33.2-4.54.1
libuuid1-2.33.2-4.54.1
util-linux-2.33.2-4.54.1
util-linux-systemd-2.33.2-4.54.1
Image SLES12-SP5-Azure-HPC-On-Demand
libblkid1-2.33.2-4.54.1
libfdisk1-2.33.2-4.54.1
libmount1-2.33.2-4.54.1
libsmartcols1-2.33.2-4.54.1
libuuid1-2.33.2-4.54.1
util-linux-2.33.2-4.54.1
util-linux-systemd-2.33.2-4.54.1
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5
libblkid-devel-2.33.2-4.54.1
libblkid1-2.33.2-4.54.1
libblkid1-32bit-2.33.2-4.54.1
libfdisk1-2.33.2-4.54.1
libmount-devel-2.33.2-4.54.1
libmount1-2.33.2-4.54.1
libmount1-32bit-2.33.2-4.54.1
libsmartcols-devel-2.33.2-4.54.1
libsmartcols1-2.33.2-4.54.1
libuuid-devel-2.33.2-4.54.1
libuuid1-2.33.2-4.54.1
libuuid1-32bit-2.33.2-4.54.1
python-libmount-2.33.2-4.54.1
util-linux-2.33.2-4.54.1
util-linux-lang-2.33.2-4.54.1
util-linux-systemd-2.33.2-4.54.1
uuidd-2.33.2-4.54.1

Ссылки

Описание

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.

Затронутые продукты
Image SLES12-SP5-Azure-HPC-BYOS:libblkid1-2.33.2-4.54.1
Image SLES12-SP5-Azure-HPC-BYOS:libfdisk1-2.33.2-4.54.1
Image SLES12-SP5-Azure-HPC-BYOS:libmount1-2.33.2-4.54.1
Image SLES12-SP5-Azure-HPC-BYOS:libsmartcols1-2.33.2-4.54.1
Ссылки