CVE-2023-0240

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.

Notes