{"id":"CVE-2026-68408","title":"wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock\n\nWhen a netlink socket that owns a PMSR session is closed,\ncfg80211_release_pmsr() clears the request…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 37e776e2e0a523731e2470dce6d563f0e8632a40 < 30c67926d41c456809857976cd3cd71b2290e0c1","Linux >= d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa < 21512b5f7a74fd18c996c22e6854efe57d570816","Linux >= a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf < 133684982dd0c24359fcc641d19d89cc17d6e5ef","Linux >= 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 < 0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e","Linux >= 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 < 2b0eab425e1f658d8fe1df7590e3b9af5959505e","Linux 28d3551f8d8cb3aec7497894d94150fe84d20e5e","Linux 72b7ea786b8e570ae11149e9089859a4a8634a13","Linux >= 6.6.130 < 6.6.160","Linux >= 6.12.78 < 6.12.101","Linux >= 6.18.20 < 6.18.42","Linux >= 6.1.167 < 6.2","Linux >= 6.19.10 < 6.20","Linux 7.0"],"published":"2026-08-10","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:44:02.159Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68408","references":[{"url":"https://git.kernel.org/stable/c/30c67926d41c456809857976cd3cd71b2290e0c1"},{"url":"https://git.kernel.org/stable/c/21512b5f7a74fd18c996c22e6854efe57d570816"},{"url":"https://git.kernel.org/stable/c/133684982dd0c24359fcc641d19d89cc17d6e5ef"},{"url":"https://git.kernel.org/stable/c/0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e"},{"url":"https://git.kernel.org/stable/c/2b0eab425e1f658d8fe1df7590e3b9af5959505e"}],"tags":["cve.org"],"epss":0.00168,"epssPercentile":0.0574,"ingestedAt":"2026-10-21T12:48:53.599Z","slug":"CVE-2026-68408","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock\n\nWhen a netlink socket that owns a PMSR session is closed,\ncfg80211_release_pmsr() clears the request's nl_portid and queues\npmsr_free_wk to call cfg80211_pmsr_process_abort() asynchronously.\n\nIf the interface tears down concurrently, cfg80211_pmsr_wdev_down()\nis called under wiphy_lock and calls cancel_work_sync(&pmsr_free_wk)\nto wait for any running work. The work function acquires wiphy_lock\nvia guard(wiphy) before calling process_abort.\n\nThis is a deadlock: wdev_down holds wiphy_lock and blocks inside\ncancel_work_sync(); pmsr_free_wk blocks trying to acquire that same\nwiphy_lock. Neither thread can proceed.\n\nThe same deadlock is reachable from cfg80211_leave_locked(), which\ncalls cfg80211_pmsr_wdev_down() for all interface types under\nwiphy_lock.\n\nFix this by converting pmsr_free_wk from a plain work_struct to a\nwiphy_work. The wiphy_work dispatcher holds wiphy_lock when running\nwork items, so the explicit guard(wiphy) in the work function is no\nlonger needed. wiphy_work_cancel() can be called safely while holding\nwiphy_lock - since wiphy_lock prevents the work from running\nconcurrently, wiphy_work_cancel() never blocks, eliminating the\ndeadlock.\n\nRemove the cancel_work_sync() for pmsr_free_wk from the\nNETDEV_GOING_DOWN handler. cfg80211_leave(), called unconditionally\njust before it, already cancels any pending work under wiphy_lock\nvia wiphy_work_cancel() inside cfg80211_pmsr_wdev_down().\n\n## Affected\n\n- `Linux >= 37e776e2e0a523731e2470dce6d563f0e8632a40 < 30c67926d41c456809857976cd3cd71b2290e0c1`\n- `Linux >= d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa < 21512b5f7a74fd18c996c22e6854efe57d570816`\n- `Linux >= a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf < 133684982dd0c24359fcc641d19d89cc17d6e5ef`\n- `Linux >= 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 < 0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e`\n- `Linux >= 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 < 2b0eab425e1f658d8fe1df7590e3b9af5959505e`\n- `Linux 28d3551f8d8cb3aec7497894d94150fe84d20e5e`\n- `Linux 72b7ea786b8e570ae11149e9089859a4a8634a13`\n- `Linux >= 6.6.130 < 6.6.160`\n- `Linux >= 6.12.78 < 6.12.101`\n- `Linux >= 6.18.20 < 6.18.42`\n- `Linux >= 6.1.167 < 6.2`\n- `Linux >= 6.19.10 < 6.20`\n- `Linux 7.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}