CVE-2026-53613

Publication date 18 June 2026

Last updated 28 October 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.0 · High

Score breakdown

Description

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.

Status

Package Ubuntu Release Status
util-linux 26.10 stonking
Vulnerable work in progress in 2.42.2-1ubuntu1
26.04 LTS resolute
Fixed in 2.41.3-3ubuntu2.2
25.10 questing Ignored end of life, was needs-triage
24.04 LTS noble
Fixed in 2.39.3-9ubuntu6.6
22.04 LTS jammy
Fixed in 2.37.2-4ubuntu3.6
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty
Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
util-linux

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.0 · High

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-8702-1
    • util-linux vulnerabilities
    • 31 August 2026

Other references

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