CVE-2026-31548

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: cfg80211: cancel pmsr_free_wk in cfg80211_pmsr_wdev_down<br /> <br /> When the nl80211 socket that originated a PMSR request is<br /> closed, cfg80211_release_pmsr() sets the request&amp;#39;s nl_portid<br /> to zero and schedules pmsr_free_wk to process the abort<br /> asynchronously. If the interface is concurrently torn down<br /> before that work runs, cfg80211_pmsr_wdev_down() calls<br /> cfg80211_pmsr_process_abort() directly. However, the already-<br /> scheduled pmsr_free_wk work item remains pending and may run<br /> after the interface has been removed from the driver. This<br /> could cause the driver&amp;#39;s abort_pmsr callback to operate on a<br /> torn-down interface, leading to undefined behavior and<br /> potential crashes.<br /> <br /> Cancel pmsr_free_wk synchronously in cfg80211_pmsr_wdev_down()<br /> before calling cfg80211_pmsr_process_abort(). This ensures any<br /> pending or in-progress work is drained before interface teardown<br /> proceeds, preventing the work from invoking the driver abort<br /> callback after the interface is gone.