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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-68408

wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock

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Status
Published
Published
Updated
Assigning organization
Linux

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 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().

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 28d3551f8d8cb3aec7497894d94150fe84d20e5e to < efe47df4de5e3e19b0670c5f2f67bdc4c9dc02afaffected
  • 37e776e2e0a523731e2470dce6d563f0e8632a40 to < 30c67926d41c456809857976cd3cd71b2290e0c1affected
  • d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa to < 21512b5f7a74fd18c996c22e6854efe57d570816affected
  • a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf to < 133684982dd0c24359fcc641d19d89cc17d6e5efaffected
  • 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 to < 0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0eaffected
  • 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 to < 2b0eab425e1f658d8fe1df7590e3b9af5959505eaffected
  • 72b7ea786b8e570ae11149e9089859a4a8634a13affected
  • 6.1.167 to < 6.1.191affected
  • 6.6.130 to < 6.6.160affected
  • 6.12.78 to < 6.12.101affected
  • 6.18.20 to < 6.18.42affected
  • 6.19.10 to < 6.20affected

Linux Linux

Default version status: affected

  • 7.0affected
  • 0 to < 7.0unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.101 to ≤ 6.12.*unaffected
  • 6.18.42 to ≤ 6.18.*unaffected
  • 7.1.6 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References