CVE-2026-31548

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

wifi: cfg80211: cancel pmsr_free_wk in cfg80211_pmsr_wdev_down

When the nl80211 socket that originated a PMSR request is

closed, cfg80211_release_pmsr() sets the request's nl_portid

to zero and schedules pmsr_free_wk to process the abort

asynchronously. If the interface is concurrently torn down

before that work runs, cfg80211_pmsr_wdev_down() calls

cfg80211_pmsr_process_abort() directly. However, the already-

scheduled pmsr_free_wk work item remains pending and may run

after the interface has been removed from the driver. This

could cause the driver's abort_pmsr callback to operate on a

torn-down interface, leading to undefined behavior and

potential crashes.

Cancel pmsr_free_wk synchronously in cfg80211_pmsr_wdev_down()

before calling cfg80211_pmsr_process_abort(). This ensures any

pending or in-progress work is drained before interface teardown

proceeds, preventing the work from invoking the driver abort

callback after the interface is gone.