SB2026050884 - Use-after-free in Linux kernel core

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Main Vulnerability Database SB2026050884

SB2026050884 - Use-after-free in Linux kernel core

Published: May 8, 2026

Security Bulletin ID SB2026050884
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

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-2026-43437)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in snd_pcm_drain() when handling a linked stream runtime after releasing the stream lock. A local user can trigger a concurrent close() on the linked stream's file descriptor to cause a denial of service.

The issue occurs because the drain path dereferences stale runtime fields from a linked stream after the runtime can be freed by concurrent unlink and detach operations.


Remediation

Install update from vendor's website.

References