CVE-2026-98858
kernel: io_uring: fix task_work add use-after-free with SQPOLL
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 18, 2026
Updated · November 4, 2026
Description
A flaw was found in the Linux kernel's io_uring subsystem. When submission queue polling (SQPOLL) is enabled, a race condition can cause the polling thread to free the ring context while another operation is still accessing it. A local user can exploit this use-after-free flaw to crash the system, resulting in a Denial of Service (DoS), or potentially achieve privilege escalation.
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 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-825 · Expired Pointer Dereference