CVE-2026-99243
kernel: kernel: Denial of Service via race condition in io_uring workqueue termination
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · November 3, 2026
Updated · November 5, 2026
Description
A flaw was found in the Linux kernel's io_uring subsystem, which can lead to a Denial of Service (DoS). Due to a missing memory barrier during asynchronous workqueue (io-wq) shutdown, a race condition can occur on systems with weakly ordered processor architectures. A local user can exploit this flaw during workqueue cleanup, causing the exiting process to hang indefinitely while waiting for worker threads to terminate.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-821 · Incorrect Synchronization