{"id":"CVE-2026-68408","state":"PUBLISHED","title":"wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock","description":"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'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().","publishedAt":"2026-08-10T12:04:28.172Z","updatedAt":"2026-10-30T12:28:30.974Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"28d3551f8d8cb3aec7497894d94150fe84d20e5e","status":"affected","lessThan":"efe47df4de5e3e19b0670c5f2f67bdc4c9dc02af","versionType":"git"},{"version":"37e776e2e0a523731e2470dce6d563f0e8632a40","status":"affected","lessThan":"30c67926d41c456809857976cd3cd71b2290e0c1","versionType":"git"},{"version":"d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa","status":"affected","lessThan":"21512b5f7a74fd18c996c22e6854efe57d570816","versionType":"git"},{"version":"a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf","status":"affected","lessThan":"133684982dd0c24359fcc641d19d89cc17d6e5ef","versionType":"git"},{"version":"6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09","status":"affected","lessThan":"0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e","versionType":"git"},{"version":"6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09","status":"affected","lessThan":"2b0eab425e1f658d8fe1df7590e3b9af5959505e","versionType":"git"},{"version":"72b7ea786b8e570ae11149e9089859a4a8634a13","status":"affected","versionType":"git"},{"version":"6.1.167","status":"affected","lessThan":"6.1.191","versionType":"semver"},{"version":"6.6.130","status":"affected","lessThan":"6.6.160","versionType":"semver"},{"version":"6.12.78","status":"affected","lessThan":"6.12.101","versionType":"semver"},{"version":"6.18.20","status":"affected","lessThan":"6.18.42","versionType":"semver"},{"version":"6.19.10","status":"affected","lessThan":"6.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/cfg80211.h","net/wireless/core.c","net/wireless/core.h","net/wireless/pmsr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/cfg80211.h","net/wireless/core.c","net/wireless/core.h","net/wireless/pmsr.c"]}],"references":["https://git.kernel.org/stable/c/efe47df4de5e3e19b0670c5f2f67bdc4c9dc02af","https://git.kernel.org/stable/c/30c67926d41c456809857976cd3cd71b2290e0c1","https://git.kernel.org/stable/c/21512b5f7a74fd18c996c22e6854efe57d570816","https://git.kernel.org/stable/c/133684982dd0c24359fcc641d19d89cc17d6e5ef","https://git.kernel.org/stable/c/0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e","https://git.kernel.org/stable/c/2b0eab425e1f658d8fe1df7590e3b9af5959505e"],"weaknesses":[],"ingestedAt":"2026-10-30T12:46:06.359Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68408.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68408","state":"PUBLISHED","datePublished":"2026-08-10T12:04:28.172Z","dateUpdated":"2026-10-30T12:28:30.974Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.390Z"},"containers":{"cna":{"title":"wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock","descriptions":[{"lang":"en","value":"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'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()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"28d3551f8d8cb3aec7497894d94150fe84d20e5e","status":"affected","lessThan":"efe47df4de5e3e19b0670c5f2f67bdc4c9dc02af","versionType":"git"},{"version":"37e776e2e0a523731e2470dce6d563f0e8632a40","status":"affected","lessThan":"30c67926d41c456809857976cd3cd71b2290e0c1","versionType":"git"},{"version":"d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa","status":"affected","lessThan":"21512b5f7a74fd18c996c22e6854efe57d570816","versionType":"git"},{"version":"a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf","status":"affected","lessThan":"133684982dd0c24359fcc641d19d89cc17d6e5ef","versionType":"git"},{"version":"6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09","status":"affected","lessThan":"0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e","versionType":"git"},{"version":"6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09","status":"affected","lessThan":"2b0eab425e1f658d8fe1df7590e3b9af5959505e","versionType":"git"},{"version":"72b7ea786b8e570ae11149e9089859a4a8634a13","status":"affected","versionType":"git"},{"version":"6.1.167","status":"affected","lessThan":"6.1.191","versionType":"semver"},{"version":"6.6.130","status":"affected","lessThan":"6.6.160","versionType":"semver"},{"version":"6.12.78","status":"affected","lessThan":"6.12.101","versionType":"semver"},{"version":"6.18.20","status":"affected","lessThan":"6.18.42","versionType":"semver"},{"version":"6.19.10","status":"affected","lessThan":"6.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/cfg80211.h","net/wireless/core.c","net/wireless/core.h","net/wireless/pmsr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/cfg80211.h","net/wireless/core.c","net/wireless/core.h","net/wireless/pmsr.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/efe47df4de5e3e19b0670c5f2f67bdc4c9dc02af"},{"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:28:30.974Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.167","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.130","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.78","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.20","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.10"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}