CVE-2021-47123
kernel: io_uring: fix ltout double free on completion race
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · March 15, 2024
Updated · August 5, 2026
Description
A vulnerability was found in io_uring component of the Linux Kernel, where a double free error found due to a race condition in io_link_timeout_fn(). This occurred when a linked timeout was not properly removed from the master request list, leading to potential use-after-free issues and DoS.
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
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.
CVSS / CWE
CVSS 3.1 · 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-415 · Double Free