Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
util-linux util-linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 path is used without , restricted non-root requests validate an target before the mount operation re-resolves that pa

CVSS 7.0 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
util-linux util-linux >= 2.17, <= 2.41.6 affected
>= 2.42, <= 2.42.4 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-53613

Vulnerability Information

Shenlong is analyzing...

Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
util-linux mount target TOCTOU allows local privilege escalation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
util-linux util-linux >= 2.17, <= 2.41.6 -

II. Public POCs for CVE-2026-53613

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-53613

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-53613 (10)

Other References for CVE-2026-53613 (4)

Same Patch Batch · util-linux · 2026-10-14 · 4 CVEs total

CVE-2026-53615 8.0 HIGH util-linux libblkid DOS extended-partition overflow produces invalid partition metadata
CVE-2026-53612 7.0 HIGH util-linux mount hook_owner TOCTOU allows local privilege escalation
CVE-2026-53614 7.0 HIGH util-linux LIBMOUNT_FORCE_MOUNT2 allows nosuid and noexec bypass

IV. Related Vulnerabilities

Same product: util-linux
Same vendor: util-linux
Same weakness: CWE-367

V. Comments for CVE-2026-53613

No comments yet

Leave a comment