CVE-2026-68408

Technical Description

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

wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock

When a netlink socket that owns a PMSR session is closed,

cfg80211_release_pmsr() clears the request's nl_portid and queues

pmsr_free_wk to call cfg80211_pmsr_process_abort() asynchronously.

If the interface tears down concurrently, cfg80211_pmsr_wdev_down()

is called under wiphy_lock and calls cancel_work_sync(&pmsr_free_wk)

to wait for any running work. The work function acquires wiphy_lock

via guard(wiphy) before calling process_abort.

This is a deadlock: wdev_down holds wiphy_lock and blocks inside

cancel_work_sync(); pmsr_free_wk blocks trying to acquire that same

wiphy_lock. Neither thread can proceed.

The same deadlock is reachable from cfg80211_leave_locked(), which

calls cfg80211_pmsr_wdev_down() for all interface types under

wiphy_lock.

Fix this by converting pmsr_free_wk from a plain work_struct to a

wiphy_work. The wiphy_work dispatche

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