7.8

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

Modified
AliasesUBUNTU-CVE-2026-31554DEBIAN-CVE-2026-31554
Published 24-04-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-31554 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 11.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.21%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 37 · Related 36
RHSA-2026:51035SUSE-SU-2026:21834-1SUSE-SU-2026:22276-1SUSE-SU-2026:22277-1SUSE-SU-2026:22278-1SUSE-SU-2026:22279-1

Timeline

  1. 24-04-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

11%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.18% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu130 products
  • linux< 6.8.0-136.136 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1061.64 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 0f4b5f972216782a4acb1ae00dcb55173847c2ff, < 027145ace09fad4c7cbcd6c61fe9b429c63eb0e5 | ≥ 0f4b5f972216782a4acb1ae00dcb55173847c2ff, < 18b7d09c2b794c71d4252f3ea2cf84ad12b73d6a | ≥ 0f4b5f972216782a4acb1ae00dcb55173847c2ff, < e2f78c7ec1655fedd945366151ba54fcb9580508 | ≥ 0f4b5f972216782a4acb1ae00dcb55173847c2ff, < 19f94b39058681dec64a10ebeb6f23fe7fc3f77a | 6.7
  • linux_kernelEOL≥ 6.7.1, < 6.12.80 | ≥ 6.13, < 6.18.21 | ≥ 6.19, < 6.19.11 | 6.7 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.12.85-1 | < 6.19.11-1

3 vendors · 133 products

References

22 links
Show all 22 references