CVE-2026-53612util-linux mount hook_owner TOCTOU allows local privilege escalation
Updated under an hour ago ()
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It affects util-linux. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.11%, higher than 1% of scored CVEs.
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util-linux is a random collection of Linux utilities. In util-linux 2.39 through 2.41.4 and 2.42 through 2.42.1, the SUID `mount` utility's `hook_owner.c` post-mount hook performs path-based `chmod()` and `lchown()` operations on a previously validated mount target. A local low-privileged user authorized by an `/etc/fstab` entry with `user` or `users` and an `X-mount.mode`, `X-mount.owner`, or `X-mount.group` option can use `renameat2(RENAME_EXCHANGE)` to race a writable ancestor of the target and redirect the privileged ownership or mode change to a root-owned path, potentially gaining root privileges. This issue is fixed in 2.41.5 and 2.42.2.
- CVSS
- 7.0 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-367
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.11% (percentile 1)
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
util-linux util-linux util_linux:util_linux (from the name) | from 2.39, < 2.41.5; from 2.42, < 2.42.2 | CNA record |
References
- https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vhx-refsource-confirm
- https://github.com/util-linux/util-linux/commit/24da33905c7115c4cbccd0afb2a469804e96467ax-refsource-misc
- https://github.com/util-linux/util-linux/commit/722c96974dd4009a334e4aee556eedaab5fb94b4x-refsource-misc
- https://github.com/util-linux/util-linux/commit/897a08c2b11dfa66975c3d24d63c7bf5f5be1a7cx-refsource-misc
- https://github.com/util-linux/util-linux/commit/d0c5adaeb3a3d823aba1377794de8f009b8152ccx-refsource-misc
- https://github.com/util-linux/util-linux/releases/tag/v2.41.5x-refsource-misc
- https://github.com/util-linux/util-linux/releases/tag/v2.42.2x-refsource-misc
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.