SB2026082471 - Race condition in Linux kernel sched

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Main Vulnerability Database SB2026082471

SB2026082471 - Race condition in Linux kernel sched

Published: August 24, 2026

Security Bulletin ID SB2026082471
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) Race condition (CVE-ID: CVE-2026-74700)

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

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 use-after-free.

The vulnerability exists due to a race condition in net/sched/cls_api.c when handling concurrent classifier creation requests in the same chain and priority. A local user can trigger concurrent u32 and flower filter operations to cause a use-after-free.

Exploitation requires concurrent requests that race during tc_new_tfilter processing.


Remediation

Install update from vendor's website.

References