{"api_version":"1","generated_at":"2026-08-11T18:53:51+00:00","cve":"CVE-2026-68405","urls":{"html":"https://cve.report/CVE-2026-68405","api":"https://cve.report/api/cve/CVE-2026-68405.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68405","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68405"},"summary":{"title":"wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock\n\nieee80211_do_stop() removes AP_VLAN packets from the parent AP\nps->bc_buf while holding ps->bc_buf.lock with IRQs disabled. It then\ncalls ieee80211_free_txskb() before dropping the lock.\n\nieee80211_free_txskb() is not just a passive SKB release. For SKBs with\nTX status state it can report a dropped frame through cfg80211/nl80211,\nand that path can reach netlink tap transmit. This is the same reason\nthe pending queue cleanup in ieee80211_do_stop() already unlinks SKBs\nunder the queue lock and frees them after IRQ state is restored.\n\nThe buggy scenario involves two paths, with each column showing the\norder within that path:\n\nAP_VLAN management TX:             AP_VLAN stop:\n1. attach ACK-status state         1. clear the running state\n2. queue a multicast SKB on        2. take ps->bc_buf.lock with IRQs\n   parent ps->bc_buf                  disabled\n                                   3. unlink the AP_VLAN SKB\n                                   4. call ieee80211_free_txskb()\n\nUnlink matching AP_VLAN SKBs from ps->bc_buf under the existing lock,\nbut move them to a local free queue. Drop the lock and restore IRQ state\nbefore calling ieee80211_free_txskb().\n\nWARNING: kernel/softirq.c:430 at __local_bh_enable_ip","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/962f755a47d7ec3bbf6c709697d7f4c5f798441d","name":"https://git.kernel.org/stable/c/962f755a47d7ec3bbf6c709697d7f4c5f798441d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef","name":"https://git.kernel.org/stable/c/be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f3858d5b1432098c1936e03d6e03dd0e33facf60","name":"https://git.kernel.org/stable/c/f3858d5b1432098c1936e03d6e03dd0e33facf60","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4b8abf43bf34791c99d99dc3be13f897adefc461","name":"https://git.kernel.org/stable/c/4b8abf43bf34791c99d99dc3be13f897adefc461","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a424985c3ef2a87ce6057a853e18d0c441a86be8","name":"https://git.kernel.org/stable/c/a424985c3ef2a87ce6057a853e18d0c441a86be8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68405","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68405","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 397a7a24ef8c2967a3e8090013f9c54714110c48 be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 397a7a24ef8c2967a3e8090013f9c54714110c48 962f755a47d7ec3bbf6c709697d7f4c5f798441d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 397a7a24ef8c2967a3e8090013f9c54714110c48 a424985c3ef2a87ce6057a853e18d0c441a86be8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 397a7a24ef8c2967a3e8090013f9c54714110c48 4b8abf43bf34791c99d99dc3be13f897adefc461 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 397a7a24ef8c2967a3e8090013f9c54714110c48 f3858d5b1432098c1936e03d6e03dd0e33facf60 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.148 6.6.* 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":["net/mac80211/iface.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef","status":"affected","version":"397a7a24ef8c2967a3e8090013f9c54714110c48","versionType":"git"},{"lessThan":"962f755a47d7ec3bbf6c709697d7f4c5f798441d","status":"affected","version":"397a7a24ef8c2967a3e8090013f9c54714110c48","versionType":"git"},{"lessThan":"a424985c3ef2a87ce6057a853e18d0c441a86be8","status":"affected","version":"397a7a24ef8c2967a3e8090013f9c54714110c48","versionType":"git"},{"lessThan":"4b8abf43bf34791c99d99dc3be13f897adefc461","status":"affected","version":"397a7a24ef8c2967a3e8090013f9c54714110c48","versionType":"git"},{"lessThan":"f3858d5b1432098c1936e03d6e03dd0e33facf60","status":"affected","version":"397a7a24ef8c2967a3e8090013f9c54714110c48","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/mac80211/iface.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.9"},{"lessThan":"3.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.148","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":"6.6.148","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.101","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.42","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.6","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc4","versionStartIncluding":"3.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock\n\nieee80211_do_stop() removes AP_VLAN packets from the parent AP\nps->bc_buf while holding ps->bc_buf.lock with IRQs disabled. It then\ncalls ieee80211_free_txskb() before dropping the lock.\n\nieee80211_free_txskb() is not just a passive SKB release. For SKBs with\nTX status state it can report a dropped frame through cfg80211/nl80211,\nand that path can reach netlink tap transmit. This is the same reason\nthe pending queue cleanup in ieee80211_do_stop() already unlinks SKBs\nunder the queue lock and frees them after IRQ state is restored.\n\nThe buggy scenario involves two paths, with each column showing the\norder within that path:\n\nAP_VLAN management TX:             AP_VLAN stop:\n1. attach ACK-status state         1. clear the running state\n2. queue a multicast SKB on        2. take ps->bc_buf.lock with IRQs\n   parent ps->bc_buf                  disabled\n                                   3. unlink the AP_VLAN SKB\n                                   4. call ieee80211_free_txskb()\n\nUnlink matching AP_VLAN SKBs from ps->bc_buf under the existing lock,\nbut move them to a local free queue. Drop the lock and restore IRQ state\nbefore calling ieee80211_free_txskb().\n\nWARNING: kernel/softirq.c:430 at __local_bh_enable_ip"}],"providerMetadata":{"dateUpdated":"2026-08-10T12:04:25.241Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef"},{"url":"https://git.kernel.org/stable/c/962f755a47d7ec3bbf6c709697d7f4c5f798441d"},{"url":"https://git.kernel.org/stable/c/a424985c3ef2a87ce6057a853e18d0c441a86be8"},{"url":"https://git.kernel.org/stable/c/4b8abf43bf34791c99d99dc3be13f897adefc461"},{"url":"https://git.kernel.org/stable/c/f3858d5b1432098c1936e03d6e03dd0e33facf60"}],"title":"wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-68405","datePublished":"2026-08-10T12:04:25.241Z","dateReserved":"2026-07-30T09:28:09.390Z","dateUpdated":"2026-08-10T12:04:25.241Z","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":"68405","Ordinal":"1","Title":"wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock","CVE":"CVE-2026-68405","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68405","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock\n\nieee80211_do_stop() removes AP_VLAN packets from the parent AP\nps->bc_buf while holding ps->bc_buf.lock with IRQs disabled. It then\ncalls ieee80211_free_txskb() before dropping the lock.\n\nieee80211_free_txskb() is not just a passive SKB release. For SKBs with\nTX status state it can report a dropped frame through cfg80211/nl80211,\nand that path can reach netlink tap transmit. This is the same reason\nthe pending queue cleanup in ieee80211_do_stop() already unlinks SKBs\nunder the queue lock and frees them after IRQ state is restored.\n\nThe buggy scenario involves two paths, with each column showing the\norder within that path:\n\nAP_VLAN management TX:             AP_VLAN stop:\n1. attach ACK-status state         1. clear the running state\n2. queue a multicast SKB on        2. take ps->bc_buf.lock with IRQs\n   parent ps->bc_buf                  disabled\n                                   3. unlink the AP_VLAN SKB\n                                   4. call ieee80211_free_txskb()\n\nUnlink matching AP_VLAN SKBs from ps->bc_buf under the existing lock,\nbut move them to a local free queue. Drop the lock and restore IRQ state\nbefore calling ieee80211_free_txskb().\n\nWARNING: kernel/softirq.c:430 at __local_bh_enable_ip","Type":"Description","Title":"wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock"}]}}}