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CVE-2026-53613

util-linux mount target TOCTOU allows local privilege escalation

CVSS score

7.0

EPSS probability

—

Risk score

0.7

Published

9 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

util-linux Mount Target TOCTOU Local Privilege Escalation

Sources read

2

Source agreement

Tam uyum

Evidence confidence

%63

Short explanation

A TOCTOU vulnerability in util-linux allows local users to redirect authorized mount operations and gain root privileges.

Why does it matter?

A local attacker can exploit this flaw to mount malicious content over sensitive system locations, achieving full root compromise.

What should be done?

  • Follow vendor advisories
  • Update affected packages
  • Review writable parent directory permissions
Chain of evidence and sources2 verified claims

util-linux paketindeki TOCTOU zaafiyeti yerel ayrıcalık yükseltmesine yol açar.

S0 · daybreach-canonical

Saldırganlar renameat2 kullanarak yolu değiştirebilir ve root yetkileri kazanabilir.

S1 · cvelistS2 · nvd
Show the technical text from the sources

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

CWE: CWE-367

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-53613 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1util-linuxutil-linux View
Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
7.0CVSS V31HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HNVD
7.0CVSS V3_1HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HCVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

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Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-53613 is associated with the following CWEs:

CWE-367: Common Weakness Enumeration Entry CWE-367

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-53613 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim
PermissionsLow
UserGerekmiyor

Official Sources and Advisories

https://github.com/util-linux/util-linux/security/advisories/GHSA-8gj5-72r3-428gvendor-advisoryhttps://github.com/util-linux/util-linux/commit/0b010025a0e429bc80355c94db86a843395d49e2vendor-advisoryhttps://github.com/util-linux/util-linux/commit/0d3d55975aa3492c62fd345eac38f41cd166c0b0vendor-advisoryhttps://github.com/util-linux/util-linux/commit/2c773f336134acf016e639abb6f12ba7341fe4b8vendor-advisoryhttps://github.com/util-linux/util-linux/commit/39fef62bf3226abb6bb018fa8750afa0327e84b4vendor-advisoryhttps://github.com/util-linux/util-linux/commit/472cc3fb2d4d47cca7aab2e0b59eb3fb8a9359ecvendor-advisoryhttps://github.com/util-linux/util-linux/commit/646fb66603d10a7ac337e14f566f1af48e3107c9vendor-advisoryhttps://github.com/util-linux/util-linux/commit/708d1b3c51932dc5ba8082c7368187715e6a8d78vendor-advisoryhttps://github.com/util-linux/util-linux/commit/78a860982e036f38fe9c0b3344998df5ac2c2ff5vendor-advisoryhttps://github.com/util-linux/util-linux/commit/85d16b341f7232c9dbb4884b632e1e956584bee9vendor-advisory

CVSS Vector Radar Chart

7.0 / 10
Attack VectorLocalComplexityHighPrivilegesLowUser Interact.NoneConfidentialityHighIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorLocal
Attack ComplexityHigh
Privileges RequiredLow privileges
User InteractionNone required
Confidentiality (Gizlilik)High
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

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Follow the vendor

U
util-linux logo
util-linux

Weakness Type (CWE & CAPEC)

CWE-367

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