CVE-2026-68405

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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"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mac80211/iface.c"], "versions": [{"version": "397a7a24ef8c2967a3e8090013f9c54714110c48", "lessThan": "0d2619e708e2ef02ba1c91642ea261d3f19d8f9a", "status": "affected", "versionType": "git"}, {"version": "397a7a24ef8c2967a3e8090013f9c54714110c48", "lessThan": "659a81b62a61440b85e02c09903be861ae7679e5", "status": "affected", "versionType": "git"}, {"version": "397a7a24ef8c2967a3e8090013f9c54714110c48", "lessThan": "aa01ef0ebbc3289154229ef58e65baf289eb9789", "status": "affected", "versionType": "git"}, {"version": "397a7a24ef8c2967a3e8090013f9c54714110c48", "lessThan": "be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef", "status": "affected", "versionType": "git"}, {"version": "397a7a24ef8c2967a3e8090013f9c54714110c48", "lessThan": "962f755a47d7ec3bbf6c709697d7f4c5f798441d", "status": "affected", "versionType": "git"}, {"version": "397a7a24ef8c2967a3e8090013f9c54714110c48", "lessThan": "a424985c3ef2a87ce6057a853e18d0c441a86be8", "status": "affected", "versionType": "git"}, {"version": "397a7a24ef8c2967a3e8090013f9c54714110c48", "lessThan": "4b8abf43bf34791c99d99dc3be13f897adefc461", "status": "affected", "versionType": "git"}, {"version": "397a7a24ef8c2967a3e8090013f9c54714110c48", "lessThan": "f3858d5b1432098c1936e03d6e03dd0e33facf60", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mac80211/iface.c"], "versions": [{"version": "3.9", "status": "affected"}, {"version": "0", "lessThan": "3.9", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", 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"versionStartIncluding": "3.9", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0d2619e708e2ef02ba1c91642ea261d3f19d8f9a"}, {"url": "https://git.kernel.org/stable/c/659a81b62a61440b85e02c09903be861ae7679e5"}, {"url": "https://git.kernel.org/stable/c/aa01ef0ebbc3289154229ef58e65baf289eb9789"}, {"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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68405", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:48:43.826413Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:55:15.546Z"}}]}}

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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"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.148", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.101", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "3.9"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:34:57.265Z"}}}, "cveMetadata": {"cveId": "CVE-2026-68405", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:55:15.546Z", "dateReserved": "2026-07-30T09:28:09.390Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-10T12:04:25.241Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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"}], "id": "CVE-2026-68405", "lastModified": "2026-11-06T17:19:31.763", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-68405", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:48:43.826413Z", "version": "2.0.3"}}]}, "published": "2026-08-10T13:20:34.053", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0d2619e708e2ef02ba1c91642ea261d3f19d8f9a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4b8abf43bf34791c99d99dc3be13f897adefc461"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/659a81b62a61440b85e02c09903be861ae7679e5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/962f755a47d7ec3bbf6c709697d7f4c5f798441d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a424985c3ef2a87ce6057a853e18d0c441a86be8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aa01ef0ebbc3289154229ef58e65baf289eb9789"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f3858d5b1432098c1936e03d6e03dd0e33facf60"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Wi-Fi subsystem vulnerability leads to system instability", "id": "2513283", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513283"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.2", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-821", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nwifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock\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.\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.\nThe buggy scenario involves two paths, with each column showing the\norder within that path:\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\nparent ps->bc_buf disabled\n3. unlink the AP_VLAN SKB\n4. call ieee80211_free_txskb()\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().\nWARNING: kernel/softirq.c:430 at __local_bh_enable_ip", "A flaw was found in the Linux kernel's `mac80211` Wi-Fi subsystem. When stopping an Access Point (AP) VLAN, the system attempts to free network packet buffers (SKBs) while interrupts are disabled. This improper handling can lead to a situation where network transmission operations occur in an inappropriate context, potentially causing system instability or a denial of service."], "name": "CVE-2026-68405", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T12:04:25Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68405\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68405\nhttps://git.kernel.org/stable/c/4b8abf43bf34791c99d99dc3be13f897adefc461\nhttps://git.kernel.org/stable/c/962f755a47d7ec3bbf6c709697d7f4c5f798441d\nhttps://git.kernel.org/stable/c/a424985c3ef2a87ce6057a853e18d0c441a86be8\nhttps://git.kernel.org/stable/c/be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef\nhttps://git.kernel.org/stable/c/f3858d5b1432098c1936e03d6e03dd0e33facf60"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[397a7a24ef8c2967a3e8090013f9c54714110c48,be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[397a7a24ef8c2967a3e8090013f9c54714110c48,962f755a47d7ec3bbf6c709697d7f4c5f798441d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[397a7a24ef8c2967a3e8090013f9c54714110c48,a424985c3ef2a87ce6057a853e18d0c441a86be8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[397a7a24ef8c2967a3e8090013f9c54714110c48,4b8abf43bf34791c99d99dc3be13f897adefc461)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[397a7a24ef8c2967a3e8090013f9c54714110c48,f3858d5b1432098c1936e03d6e03dd0e33facf60)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T16:15:04.433907+00:00", "updated": "2026-08-13T03:15:12.161145+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}