CVE-2026-76642util-linux libmount Privilege Escalation via Failed Mount Helper
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-390
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
util-linux util-linux util_linux:util_linux (from the name) | from 2.39 before 2.41.6; from 2.42 before 2.42.3 | CNA record |
References
- https://github.com/util-linux/util-linux/security/advisories/GHSA-m25x-3hj9-m26fvendor-advisory
- https://github.com/util-linux/util-linux/commit/f57cea130839c0af8dc0525274267ae4cfd66bbfpatch
- https://github.com/util-linux/util-linux/commit/1d14676ea70003e9f5b2a6a76af0cadb1190411apatch
- https://github.com/util-linux/util-linux/commit/a15c00a9e545aa8b9cf6ec0f888ff6c7b3eaeedcpatch
- https://github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.c#L476technical-description
- https://github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.c#L892technical-description
- https://github.com/util-linux/util-linuxproduct
- https://www.vulncheck.com/advisories/util-linux-libmount-privilege-escalation-via-failed-mount-helperthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.