High 7.0Published Oct 14, 2026

CVE-2026-53613util-linux mount target TOCTOU allows local privilege escalation

Updated under an hour ago (Oct 27, 2026, 12:50 AM ET)

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EPSS puts the chance of exploitation in the next 30 days at 0.16%, higher than 5% of scored CVEs.

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Every CVE for util-linux

Exploited in the last 30 days

util-linux is a random collection of Linux utilities. In util-linux 2.17 through 2.41.6 and 2.42 through 2.42.3, and in 2.42.4 when the legacy `mount(2)` path is used without `/proc`, restricted non-root `mount` requests validate an `/etc/fstab` target before the mount operation re-resolves that pathname. A local low-privileged user authorized by an fstab `user` or `users` entry whose target has an attacker-writable ancestor can use `renameat2(RENAME_EXCHANGE)` to swap a path component and redirect an authorized mount to a root-owned location, such as mounting attacker-controlled content over `/etc/sudoers.d`, and thereby gain root privileges. Versions 2.41.5 and 2.42.2 pin targets for the new mount API, and 2.42.4 pins legacy targets through `/proc/self/fd`; the documented legacy fallback without `/proc` remains affected.

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): 0.16% (percentile 5)
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

util-linux util-linux util_linux:util_linux (from the name)	from 2.17, <= 2.41.6; from 2.42, <= 2.42.4	CNA record

References

References

https://github.com/util-linux/util-linux/security/advisories/GHSA-8gj5-72r3-428g	x-refsource-confirm
https://github.com/util-linux/util-linux/commit/0b010025a0e429bc80355c94db86a843395d49e2	x-refsource-misc
https://github.com/util-linux/util-linux/commit/0d3d55975aa3492c62fd345eac38f41cd166c0b0	x-refsource-misc
https://github.com/util-linux/util-linux/commit/2c773f336134acf016e639abb6f12ba7341fe4b8	x-refsource-misc
https://github.com/util-linux/util-linux/commit/39fef62bf3226abb6bb018fa8750afa0327e84b4	x-refsource-misc
https://github.com/util-linux/util-linux/commit/472cc3fb2d4d47cca7aab2e0b59eb3fb8a9359ec	x-refsource-misc
https://github.com/util-linux/util-linux/commit/646fb66603d10a7ac337e14f566f1af48e3107c9	x-refsource-misc
https://github.com/util-linux/util-linux/commit/708d1b3c51932dc5ba8082c7368187715e6a8d78	x-refsource-misc
https://github.com/util-linux/util-linux/commit/78a860982e036f38fe9c0b3344998df5ac2c2ff5	x-refsource-misc
https://github.com/util-linux/util-linux/commit/85d16b341f7232c9dbb4884b632e1e956584bee9	x-refsource-misc
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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.