SB20260816252 - Use-after-free in Linux kernel trace

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Main Vulnerability Database SB20260816252

SB20260816252 - Use-after-free in Linux kernel trace

Published: August 16, 2026

Security Bulletin ID SB20260816252
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-2026-74471)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [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]


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

The vulnerability exists due to a use-after-free in trace_module_add_events() and the tracing subsystem when handling failed event registration during module loading. A local user can load a module that triggers event registration failure and subsequently access tracefs or tracing operations to cause a denial of service.

Exploitation requires a module loading scenario in which event registration fails and the module memory is later freed, leaving a stale trace_event_call pointer in trace_event_file.


Remediation

Install update from vendor's website.

References