What is CVE-2026-27456?

CVE-2026-27456 is a medium-severity vulnerability in Kernel 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 Kernel 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: 0.001 (2.0th 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

Kernel Util-linux
Util-linux — versions < 2.41.4

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (Product, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-27456?: CVE-2026-27456 is a medium-severity vulnerability in Kernel 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.