CVE-2026-99253
kernel: kernel: Denial of Service via race condition in io_uring cancellation
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. This flaw allows a local user to cause a Denial of Service (DoS) due to a race condition in the request cancellation mechanism. When a process terminates or executes a new program, a wake-up notification can be missed before the task enters a sleep state, causing the process to hang indefinitely while waiting for pending operations.
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