CVE-2026-76642: Util-Linux

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.

Affected products

• Util-Linux Util-Linux: from 2.39, before 2.41.6 (fixed in 2.41.6); from 2.42, before 2.42.3 (fixed in 2.42.3)

Published 2026-09-03. Last modified 2026-09-24.