CVE-2023-21400
kernel: io_uring: io_defer_entry object double free vulnerability
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 5, 2023
Updated · November 21, 2025
Description
A double-free vulnerability was found in the io_uring subsystem in the Linux kernel. This issue may allow a malicious local user to crash the kernel or elevate their privileges on the system.
Statement
No Red Hat products are affected by this flaw, as the io_uring subsystem is not enabled in any shipping kernel release.
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 · 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 · Use After Free