{"api_version":"1","generated_at":"2026-08-13T22:05:24+00:00","cve":"CVE-2026-68408","urls":{"html":"https://cve.report/CVE-2026-68408","api":"https://cve.report/api/cve/CVE-2026-68408.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68408","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68408"},"summary":{"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().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-10 13:20:34","updated_at":"2026-08-10 13:20:34"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/21512b5f7a74fd18c996c22e6854efe57d570816","name":"https://git.kernel.org/stable/c/21512b5f7a74fd18c996c22e6854efe57d570816","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2b0eab425e1f658d8fe1df7590e3b9af5959505e","name":"https://git.kernel.org/stable/c/2b0eab425e1f658d8fe1df7590e3b9af5959505e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e","name":"https://git.kernel.org/stable/c/0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/133684982dd0c24359fcc641d19d89cc17d6e5ef","name":"https://git.kernel.org/stable/c/133684982dd0c24359fcc641d19d89cc17d6e5ef","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68408","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68408","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa 21512b5f7a74fd18c996c22e6854efe57d570816 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf 133684982dd0c24359fcc641d19d89cc17d6e5ef git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 2b0eab425e1f658d8fe1df7590e3b9af5959505e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 28d3551f8d8cb3aec7497894d94150fe84d20e5e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 37e776e2e0a523731e2470dce6d563f0e8632a40 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 72b7ea786b8e570ae11149e9089859a4a8634a13 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.78 6.12.101 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.20 6.18.42 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.167 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.130 6.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.19.10 6.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.101 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.42 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.6 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc4 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/net/cfg80211.h","net/wireless/core.c","net/wireless/core.h","net/wireless/pmsr.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"21512b5f7a74fd18c996c22e6854efe57d570816","status":"affected","version":"d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa","versionType":"git"},{"lessThan":"133684982dd0c24359fcc641d19d89cc17d6e5ef","status":"affected","version":"a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf","versionType":"git"},{"lessThan":"0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e","status":"affected","version":"6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09","versionType":"git"},{"lessThan":"2b0eab425e1f658d8fe1df7590e3b9af5959505e","status":"affected","version":"6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09","versionType":"git"},{"status":"affected","version":"28d3551f8d8cb3aec7497894d94150fe84d20e5e","versionType":"git"},{"status":"affected","version":"37e776e2e0a523731e2470dce6d563f0e8632a40","versionType":"git"},{"status":"affected","version":"72b7ea786b8e570ae11149e9089859a4a8634a13","versionType":"git"},{"lessThan":"6.12.101","status":"affected","version":"6.12.78","versionType":"semver"},{"lessThan":"6.18.42","status":"affected","version":"6.18.20","versionType":"semver"},{"lessThan":"6.2","status":"affected","version":"6.1.167","versionType":"semver"},{"lessThan":"6.7","status":"affected","version":"6.6.130","versionType":"semver"},{"lessThan":"6.20","status":"affected","version":"6.19.10","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/net/cfg80211.h","net/wireless/core.c","net/wireless/core.h","net/wireless/pmsr.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.0"},{"lessThan":"7.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.101","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.42","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc4","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.101","versionStartIncluding":"6.12.78","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.42","versionStartIncluding":"6.18.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.6","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc4","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.167","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.130","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.10","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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()."}],"providerMetadata":{"dateUpdated":"2026-08-10T12:04:28.172Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}],"title":"wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-68408","datePublished":"2026-08-10T12:04:28.172Z","dateReserved":"2026-07-30T09:28:09.390Z","dateUpdated":"2026-08-10T12:04:28.172Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-10 13:20:34","lastModifiedDate":"2026-08-10 13:20:34","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"68408","Ordinal":"1","Title":"wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlo","CVE":"CVE-2026-68408","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68408","Ordinal":"1","NoteData":"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().","Type":"Description","Title":"wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlo"}]}}}