CVE-2021-4023
kernel: Improper IO-uring request cancellation operation allows local users to cause a crash
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 8, 2021
Updated · November 22, 2025
Description
A flaw was found in the io-workqueue implementation in the Linux kernel. The kernel can panic when an improper cancellation operation triggers the submission of new io-uring operations during a shortage of free space. This flaw allows a local user with permissions to execute io-uring requests to possibly crash the system.
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-200 · Exposure of Sensitive Information to an Unauthorized Actor