Debian: CVE-2023-0240: linux -- security update

Debian: CVE-2023-0240: linux -- security update

Severity

7

CVSS

(AV:L/AC:L/Au:S/C:C/I:C/A:C)

Published

01/30/2023

Created

03/07/2023

Added

03/06/2023

Modified

01/30/2025

Description

There is a logic error in io_uring's implementation which can be used to trigger a use-after-free vulnerability leading to privilege escalation. In the io_prep_async_work function the assumption that the last io_grab_identity call cannot return false is not true, and in this case the function will use the init_cred or the previous linked requests identity to do operations instead of using the current identity. This can lead to reference counting issues causing use-after-free. We recommend upgrading past version 5.10.161.

Solution(s)

• debian-upgrade-linux

References

• https://attackerkb.com/topics/cve-2023-0240
• CVE - 2023-0240
• DLA-3349-1