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Back to active CVEs
High · CVSS 7.8CVE-2026-31554

futex: Require sys_futex_requeue() to have identical flagsCVE-2026-31554

Answer in brief

CVE-2026-31554 records a High severity (CVSS 7.8) vulnerability in futex: Require sys_futex_requeue() to have identical flags. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 24, 2026Updated Oct 16, 2026Source checked Oct 16, 2026First seen by HOL Oct 16, 2026Material review Oct 16, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=0f4b5f972216782a4acb1ae00dcb55173847c2ff <027145ace09fad4c7cbcd6c61fe9b429c63eb0e5 || >=0f4b5f972216782a4acb1ae00dcb55173847c2ff <18b7d09c2b794c71d4252f3ea2cf84ad12b73d6a || >=0f4b5f972216782a4acb1ae00dcb55173847c2ff <e2f78c7ec1655fedd945366151ba54fcb9580508 || >=0f4b5f972216782a4acb1ae00dcb55173847c2ff <19f94b39058681dec64a10ebeb6f23fe7fc3f77a027145ace09fad4c7cbcd6c61fe9b429c63eb0e5, 18b7d09c2b794c71d4252f3ea2cf84ad12b73d6a, e2f78c7ec1655fedd945366151ba54fcb9580508, 19f94b39058681dec64a10ebeb6f23fe7fc3f77a
Linux/Linuxgeneric6.7Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 027145ace09fad4c7cbcd6c61fe9b429c63eb0e5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Apr 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 16, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: futex: Require sys_futex_requeue() to have identical flags Nicholas reported that his LLM found it was possible to create a UaF when sys_futex_requeue() is used with different flags. The initial motivation for allowing different flags was the variable sized futex, but since that hasn't been merged (yet), simply mandate the flags are identical, as is the case for the old style sys_futex() requeue operations.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 16, 2026
References
4 linked sources
Open source record