SB20261022400 - Race condition in Linux kernel events

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Main Vulnerability Database SB20261022400

SB20261022400 - Race condition in Linux kernel events

Published: October 22, 2026

Security Bulletin ID SB20261022400
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Race condition (CVE-ID: CVE-2026-98790)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to trigger a kernel warning through a race condition in performance-event handling.

The vulnerability exists due to improper synchronization between perf_event_exit_task() and perf_pending_task() in the Linux kernel performance-event subsystem when executing a new program through begin_new_exec(). A local user can trigger concurrent execution and performance-event processing to cause perf_sigtrap() to continue after the event context's task has been set to TASK_TOMBSTONE, triggering WARN_ON_ONCE(event->ctx->task != current).


Remediation

Install update from vendor's website.

References