{"id":"CVE-2026-68405","summary":"wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock","details":"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-\u003ebc_buf while holding ps-\u003ebc_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-\u003ebc_buf.lock with IRQs\n   parent ps-\u003ebc_buf                  disabled\n                                   3. unlink the AP_VLAN SKB\n                                   4. call ieee80211_free_txskb()\n\nUnlink matching AP_VLAN SKBs from ps-\u003ebc_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","modified":"2026-08-21T03:30:15.155467411Z","published":"2026-08-10T12:04:25.241Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68405.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0d2619e708e2ef02ba1c91642ea261d3f19d8f9a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4b8abf43bf34791c99d99dc3be13f897adefc461"},{"type":"WEB","url":"https://git.kernel.org/stable/c/659a81b62a61440b85e02c09903be861ae7679e5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/962f755a47d7ec3bbf6c709697d7f4c5f798441d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a424985c3ef2a87ce6057a853e18d0c441a86be8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aa01ef0ebbc3289154229ef58e65baf289eb9789"},{"type":"WEB","url":"https://git.kernel.org/stable/c/be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f3858d5b1432098c1936e03d6e03dd0e33facf60"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68405.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68405"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"397a7a24ef8c2967a3e8090013f9c54714110c48"},{"fixed":"0d2619e708e2ef02ba1c91642ea261d3f19d8f9a"},{"fixed":"659a81b62a61440b85e02c09903be861ae7679e5"},{"fixed":"aa01ef0ebbc3289154229ef58e65baf289eb9789"},{"fixed":"be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef"},{"fixed":"962f755a47d7ec3bbf6c709697d7f4c5f798441d"},{"fixed":"a424985c3ef2a87ce6057a853e18d0c441a86be8"},{"fixed":"4b8abf43bf34791c99d99dc3be13f897adefc461"},{"fixed":"f3858d5b1432098c1936e03d6e03dd0e33facf60"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68405.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.9.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68405.json"}}],"schema_version":"1.9.0"}