wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68408
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:34 UTC
Updated2026-08-10 13:20:34 UTC
DescriptionIn 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 dispatcher holds wiphy_lock when running work items, so the explicit guard(wiphy) in the work function is no longer needed. wiphy_work_cancel() can be called safely while holding wiphy_lock - since wiphy_lock prevents the work from running concurrently, wiphy_work_cancel() never blocks, eliminating the deadlock. Remove the cancel_work_sync() for pmsr_free_wk from the NETDEV_GOING_DOWN handler. cfg80211_leave(), called unconditionally just before it, already cancels any pending work under wiphy_lock via wiphy_work_cancel() inside cfg80211_pmsr_wdev_down().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa 21512b5f7a74fd18c996c22e6854efe57d570816 git Not specified
CNA Linux Linux affected a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf 133684982dd0c24359fcc641d19d89cc17d6e5ef git Not specified
CNA Linux Linux affected 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e git Not specified
CNA Linux Linux affected 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 2b0eab425e1f658d8fe1df7590e3b9af5959505e git Not specified
CNA Linux Linux affected 28d3551f8d8cb3aec7497894d94150fe84d20e5e git Not specified
CNA Linux Linux affected 37e776e2e0a523731e2470dce6d563f0e8632a40 git Not specified
CNA Linux Linux affected 72b7ea786b8e570ae11149e9089859a4a8634a13 git Not specified
CNA Linux Linux affected 6.12.78 6.12.101 semver Not specified
CNA Linux Linux affected 6.18.20 6.18.42 semver Not specified
CNA Linux Linux affected 6.1.167 6.2 semver Not specified
CNA Linux Linux affected 6.6.130 6.7 semver Not specified
CNA Linux Linux affected 6.19.10 6.20 semver Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/21512b5f7a74fd18c996c22e6854efe57d570816 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b0eab425e1f658d8fe1df7590e3b9af5959505e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/133684982dd0c24359fcc641d19d89cc17d6e5ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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