Race condition in Util-linux - CVE-2026-27456
Published: April 1, 2026
Vulnerability identifier: #VU124785
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-27456
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: kernel.org
Affected software:
Util-linux
Util-linux
Detailed vulnerability description
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to a race condition in the SUID binary /usr/bin/mount from util-linux. A local user can mount any root-owned file or block device that contains a valid filesystem, gaining full read access to its contents.
The mounted filesystem has MS_SECURE flags applied (nosuid, nodev, noexec), which prevents execution of SUID binaries but does not restrict reading data.
How to mitigate CVE-2026-27456
Install updates from vendor's website.