SB20260816464 - Use-after-free in Linux kernel trace

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Main Vulnerability Database SB20260816464

SB20260816464 - Use-after-free in Linux kernel trace

Published: August 16, 2026

Security Bulletin ID SB20260816464
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-2026-72071)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 user_event_mm_dup() and the user_events enabler handling in kernel/trace/trace_events_user.c when walking the parent mm enabler list during fork() while an enabler is concurrently unregistered. A local user can register an enabler and then concurrently unregister it and call fork() to cause a denial of service.

Exploitation requires access to open user_events_data and a race between concurrent operations in a multithreaded process.


Remediation

Install update from vendor's website.

References