CVE-2026-76642

High

Description

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.

SeverityHigh

CVSS7.8

Exploit probability—

ProductUtil-linux

PublishedSep 3, 2026

First seenSep 3, 2026

Weakness typeCWE-390CWE-390

How to fix

Update

util-linux util-linux2.41.6, 2.42.3 or later

Patches

Vendor advisories

github.com/util-linux/util-linux/security/advisories/GHSA-m25x-3hj9-m26f

Affected products

Product	Affected versions	Fixed in
util-linux util-linux	2.39 ≤ v < 2.41.6, 2.42 ≤ v < 2.42.3	2.41.6, 2.42.3

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