futex: Require sys_futex_requeue() to have identical flags

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Summary

CVECVE-2026-31554
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:29 UTC
Updated2026-04-27 20:14:55 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000180000 probability, percentile 0.046080000 (date 2026-04-27)

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0f4b5f972216782a4acb1ae00dcb55173847c2ff 027145ace09fad4c7cbcd6c61fe9b429c63eb0e5 git Not specified
CNA Linux Linux affected 0f4b5f972216782a4acb1ae00dcb55173847c2ff 18b7d09c2b794c71d4252f3ea2cf84ad12b73d6a git Not specified
CNA Linux Linux affected 0f4b5f972216782a4acb1ae00dcb55173847c2ff e2f78c7ec1655fedd945366151ba54fcb9580508 git Not specified
CNA Linux Linux affected 0f4b5f972216782a4acb1ae00dcb55173847c2ff 19f94b39058681dec64a10ebeb6f23fe7fc3f77a git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/19f94b39058681dec64a10ebeb6f23fe7fc3f77a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/027145ace09fad4c7cbcd6c61fe9b429c63eb0e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/18b7d09c2b794c71d4252f3ea2cf84ad12b73d6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e2f78c7ec1655fedd945366151ba54fcb9580508 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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