MediumFix available
util-linux — security advisory
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.
- Products
- util-linux
- Affected versions
- 2.20.1-5.1ubuntu10, 2.20.1-5.1ubuntu11, 2.20.1-5.1ubuntu12, 2.20.1-5.1ubuntu13, 2.20.1-5.1ubuntu14, 2.20.1-5.1ubuntu15, 2.20.1-5.1ubuntu16, 2.20.1-5.1ubuntu17, 2.20.1-5.1ubuntu18, 2.20.1-5.1ubuntu19, 2.20.1-5.1ubuntu20, 2.20.1-5.1ubuntu20.1, 2.20.1-5.1ubuntu20.2, 2.20.1-5.1ubuntu20.3, 2.20.1-5.1ubuntu20.4, 2.20.1-5.1ubuntu20.6, 2.20.1-5.1ubuntu20.7, 2.20.1-5.1ubuntu20.9, 2.20.1-5.1ubuntu9, 2.26.2-6ubuntu3, 2.27-3ubuntu1, 2.27.1-1ubuntu2, 2.27.1-1ubuntu3, 2.27.1-1ubuntu4, 2.27.1-3ubuntu1, 2.27.1-4ubuntu1, 2.27.1-6ubuntu1, 2.27.1-6ubuntu2, 2.27.1-6ubuntu3, 2.27.1-6ubuntu3.1, 2.27.1-6ubuntu3.10, 2.27.1-6ubuntu3.10+esm2, 2.27.1-6ubuntu3.2, 2.27.1-6ubuntu3.3, 2.27.1-6ubuntu3.4, 2.27.1-6ubuntu3.6, 2.27.1-6ubuntu3.7, 2.27.1-6ubuntu3.8, 2.27.1-6ubuntu3.9, 2.30.1-0ubuntu4, 2.30.2-0.1ubuntu1, 2.30.2-0.1ubuntu2, 2.30.2-0.1ubuntu3, 2.31.1-0.4ubuntu2, 2.31.1-0.4ubuntu3, 2.31.1-0.4ubuntu3.1, 2.31.1-0.4ubuntu3.2, 2.31.1-0.4ubuntu3.3, 2.31.1-0.4ubuntu3.4, 2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6, 2.31.1-0.4ubuntu3.7, 2.34-0.1ubuntu2, 2.34-0.1ubuntu4, 2.34-0.1ubuntu5, 2.34-0.1ubuntu6, 2.34-0.1ubuntu7, 2.34-0.1ubuntu8, 2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1, 2.34-0.1ubuntu9.3, 2.34-0.1ubuntu9.4, 2.34-0.1ubuntu9.5, 2.34-0.1ubuntu9.6, 2.34-0.1ubuntu9.6+esm1, 2.36.1-8ubuntu1, 2.37.2-4ubuntu1, 2.37.2-4ubuntu2, 2.37.2-4ubuntu3, 2.37.2-4ubuntu3.3, 2.37.2-4ubuntu3.4, 2.37.2-4ubuntu3.5, 2.39.1-4ubuntu2, 2.39.2-6ubuntu1, 2.39.3-6ubuntu2, 2.39.3-9ubuntu2, 2.39.3-9ubuntu4, 2.39.3-9ubuntu6, 2.39.3-9ubuntu6.1, 2.39.3-9ubuntu6.2, 2.39.3-9ubuntu6.3, 2.39.3-9ubuntu6.4, 2.39.3-9ubuntu6.5, 2.40.2-14ubuntu1, 2.41-4ubuntu2, 2.41-4ubuntu3, 2.41-4ubuntu4, 2.41-4ubuntu4.1, 2.41-4ubuntu4.2, 2.41.2-4ubuntu1, 2.41.2-4ubuntu2, 2.41.2-4ubuntu3, 2.41.3-3ubuntu1, 2.41.3-3ubuntu2, 2.42.2-1ubuntu2
- Fixed versions
- 2.37.2-4ubuntu3.6, 2.39.3-9ubuntu6.6, 2.41.3-3ubuntu2.2
- CVEs
- CVE-2026-27456
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:43 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-27456
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: 2.37.2-4ubuntu3.6
util-linux
Fixed versions: 2.39.3-9ubuntu6.6
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: 2.41.3-3ubuntu2.2
Complete source record
{
"id": "ea68e78fc7ea67cd680917558e258c43c1d966753d093fb7f1caff006d2a27c5",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-27456",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-27456",
"summary": "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.",
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"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-27456",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
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},
{
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}
],
"affected": [
{
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],
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"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
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{
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{
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},
{
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},
{
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},
{
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"package": {
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},
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],
"database_specific": {
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},
"ecosystem_specific": {
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},
{
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},
{
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},
{
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"https://www.cve.org/CVERecord?id=CVE-2026-27456",
"https://github.com/util-linux/util-linux/security/advisories/GHSA-qq4x-vfq4-9h9g",
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"evidence": "/upstream"
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},
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"document_id": 359096,
"published_at": "2026-04-03T22:16:00+00:00"
}