High severity7.8NVD Advisory· Published Sep 3, 2026· Updated Sep 24, 2026
CVE-2026-76642
CVE-2026-76642
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
5- Range: <=2.41.5, <2.42.2
- osv-coords4 versionspkg:rpm/opensuse/util-linux&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/util-linux-systemd&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/util-linux&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/python-libmount&distro=openSUSE%20Leap%2016.0
< 2.42.3-1.1+ 3 more
- (no CPE)range: < 2.42.3-1.1
- (no CPE)range: < 2.41.1-160000.5.1
- (no CPE)range: < 2.41.1-160000.5.1
- (no CPE)range: < 2.41.1-160000.5.1
Patches
Vulnerability mechanics
References
7- github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.cnvd
- github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.cnvd
- github.com/util-linux/util-linux/commit/1d14676ea70003e9f5b2a6a76af0cadb1190411anvd
- github.com/util-linux/util-linux/commit/a15c00a9e545aa8b9cf6ec0f888ff6c7b3eaeedcnvd
- github.com/util-linux/util-linux/commit/f57cea130839c0af8dc0525274267ae4cfd66bbfnvd
- github.com/util-linux/util-linux/security/advisories/GHSA-m25x-3hj9-m26fnvd
- www.vulncheck.com/advisories/util-linux-libmount-privilege-escalation-via-failed-mount-helpernvd
News mentions
0No linked articles in our index yet.