{"id":"CVE-2026-68405","title":"wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock","summary":"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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < 0d2619e708e2ef02ba1c91642ea261d3f19d8f9a","Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < 659a81b62a61440b85e02c09903be861ae7679e5","Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < aa01ef0ebbc3289154229ef58e65baf289eb9789","Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef","Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < 962f755a47d7ec3bbf6c709697d7f4c5f798441d","Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < a424985c3ef2a87ce6057a853e18d0c441a86be8","Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < 4b8abf43bf34791c99d99dc3be13f897adefc461","Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < f3858d5b1432098c1936e03d6e03dd0e33facf60","Linux 3.9"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:48:43.826413Z"},"published":"2026-08-10","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:55:15.546Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68405","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"}],"tags":["cve.org"],"epss":0.0022,"epssPercentile":0.12599,"ingestedAt":"2026-11-06T18:00:12.610Z","slug":"CVE-2026-68405","body":"## Overview\n\nIn 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\n\n## Affected\n\n- `Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < 0d2619e708e2ef02ba1c91642ea261d3f19d8f9a`\n- `Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < 659a81b62a61440b85e02c09903be861ae7679e5`\n- `Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < aa01ef0ebbc3289154229ef58e65baf289eb9789`\n- `Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef`\n- `Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < 962f755a47d7ec3bbf6c709697d7f4c5f798441d`\n- `Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < a424985c3ef2a87ce6057a853e18d0c441a86be8`\n- `Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < 4b8abf43bf34791c99d99dc3be13f897adefc461`\n- `Linux >= 397a7a24ef8c2967a3e8090013f9c54714110c48 < f3858d5b1432098c1936e03d6e03dd0e33facf60`\n- `Linux 3.9`\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":[]}