SB20260916109 - Use-after-free in Linux kernel futex

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Main Vulnerability Database SB20260916109

SB20260916109 - Use-after-free in Linux kernel futex

Published: September 16, 2026

Security Bulletin ID SB20260916109
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-90003)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to execute arbitrary code, disclose sensitive information, or cause a denial of service.

The vulnerability exists due to a use-after-free in the futex requeue priority-inheritance handling when racing an early waiter wakeup with a priority-inheritance futex requeue. A local user can trigger FUTEX_CMP_REQUEUE_PI operations to access a waiter's stack-allocated futex queue after the waiter returns from the system call.

Exploitation is limited to systems using PREEMPT_RT.


Remediation

Install update from vendor's website.

References