CVE-2026-98706

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

wifi: mac80211: drain PS delivery work during station teardown

Removing an AP or mesh station can notify the driver and wake TXQs after

the station has already been removed from the driver, and can update

num_sta_ps and the power-save queues after station cleanup has purged

them.

sta_deliver_ps_frames() tests sta->dead only before it starts delivery. A

worker that passes that test can be delayed while teardown sets sta->dead

and removes the station from the driver; when it resumes it still runs the

full delivery.

The existing cancel_work_sync() sits near the end of

__cleanup_single_sta(), after the final driver state transition and after

PS accounting and queue purging, so it drains the worker only once the

state it has to protect has already changed. Before commit d34ba2168a3c

("mac80211: don't delay station destruction") cleanup was deferred

through the same ordered workqueue as the delivery work, which kept the

two ordered.

Cancel the work after setting sta->dead and before moving the driver

state, and move the existing cancellation to the start of

__cleanup_single_sta(). The first drain closes the driver-lifetime window;

driver callbacks during the remaining state transitions can still queue

drv_deliver_wk through ieee80211_sta_block_awake(), so retain the second

drain at the start of __cleanup_single_sta(). That drain also covers

insertion failures, which reach cleanup without setting sta->dead.