CVE-2026-80777

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

futex/pi: Plug private futex exec() race

The check for private futexes whether the waiter's mm, which is stored in

the futex_key and copied into the pi_state, is the same as the owner's mm

is not sufficient for exec(). exec() has a gap where the mm check fails to

give the correct answer:

exec()

...

exec_release_mm()

futex_exec_release()

tsk::futex::exit_state = EXITING;

cleanup_robust_list();

1) tsk::futex::exit_state = OK;

...

old_mm = tsk::mm;

2) tsk::mm = ->mm;

Between #1 and #2 the check for the mm is wrong as that mm is about to be

swapped out and eventually freed.

Plug this gap by:

1) Setting tsk::futex::exit_state to FUTEX_STATE_DEAD in

futex_exec_release()

2) Setting tsk::futex::exit_state to FUTEX_STATE_OK after

the mm has been switched.

From a futex point of view the task is dead after it finished the robust

list cleanup up to the point where i

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References