CVE-2023-3389

kernel: Racing a io_uring cancel poll request with a linked timeout can cause a UAF in a hrtimer

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · June 16, 2023

Updated · October 15, 2026

Description

A use-after-free flaw was found in the Linux kernel’s io_uring functionality. This flaw allows a local user to crash the system.

Statement

The io_uring disabled before Red Hat Enterprise Linux 9.3, so all versions before 9 are not affected.

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 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CWE-416 · Use After Free