What is CVE-2026-27456?

CVE-2026-27456 is a medium-severity vulnerability in Util-linux, classified under Improper Link Resolution Before File Access. CVSS score: 4.7/10. Published 2026-04-03.

How severe is CVE-2026-27456?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Privilege escalation in Util-linux

CVE-2026-27456

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…

EPSS: 0.000 (2.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Util-linux — versions < 2.41.4

Weakness classification (CWE)

References

https://github.com/util-linux/util-linux/security/advisories/GHSA-qq4x-vfq4-9h9g (x_refsource_CONFIRM)
https://github.com/util-linux/util-linux/commit/5e390467b26a3cf3fecc04e1a0d482dff3162fc4 (x_refsource_MISC)
https://github.com/util-linux/util-linux/releases/tag/v2.41.4 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-27456?: CVE-2026-27456 is a medium-severity vulnerability in Util-linux, classified under Improper Link Resolution Before File Access. CVSS score: 4.7/10. Published 2026-04-03.
How severe is CVE-2026-27456?: Medium severity. CVSS v3 base score is 4.7 out of 10.