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CVE-2026-53612VulnerabilityPublished Updated

Microsoft · util-linux mount hook_owner TOCTOU allows local privilege escalation

Affects MicrosoftSource GCVE Database

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Not known to be exploited.

Data as of 6 Nov 2026, 11:23 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS
0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 17 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hatutil-linuxpkg:rpm/util-linuxOther threatsAffected
  • =3.0
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

CVE-2026-53612 is a local privilege escalation vulnerability in util-linux version 3.0 related to a time-of-check to time-of-use (TOCTOU) race condition in the mount hook_owner functionality. This flaw could allow a local attacker to escalate privileges on the affected system.

References

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