SB20261103135 - Race condition in Linux kernel io_uring

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Main Vulnerability Database SB20261103135

SB20261103135 - Race condition in Linux kernel io_uring

Published: November 3, 2026

Security Bulletin ID SB20261103135
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Race condition (CVE-ID: CVE-2026-99243)

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

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service by leaving an exiting task waiting indefinitely for io_uring workers.

The vulnerability exists due to a race condition caused by missing memory ordering in the Linux kernel io_uring worker queue when worker creation overlaps with task exit on weakly ordered architectures. A local user can trigger concurrent worker creation and task exit after closing all io_uring rings to leave worker-creation task work queued, causing the exiting task to wait indefinitely on worker_done.


Remediation

Install update from vendor's website.

References