{"id":"CVE-2026-93804","summary":"wifi: mac80211: ibss: wait for in-flight TX on disconnect","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: ibss: wait for in-flight TX on disconnect\n\nWhile leaving an IBSS in ieee80211_ibss_disconnect() mac80211 flushes\nstations, turns the carrier off and immediately tells the driver to\nleave as well. While there may be synchronize_net() in station flush\nand in this code later, packets can still be transmitted due to\ncross-CPU race conditions after carrier off is set.\nTherefore, it's possible for a race to happen where a TX to the\ndriver occurs while or after telling it to leave the IBSS. This can\nbe confusing to drivers, and in the case of iwlwifi leads to an\nattempt to use invalid queues.\n\nMove netif_carrier_off() to occur before sta_info_flush() during\nIBSS disconnect, and add synchronize_net() if flushing didn't,\nso that the synchronize_net() always happens between turning the\ncarrier off and telling the driver, avoiding this race.","modified":"2026-09-26T03:48:26.808186850Z","published":"2026-09-24T16:02:38.223Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93804.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/20a3fb5e1a95caa34896853ca17a50d21c754969"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b3451e6971248250312ad32dd7f63cc9f0a925f5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d0e69d9afa59b93c30294eba89b1f15f69e91105"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93804.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93804"},{"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":"86a2ea4134b48f6371103cfceb521bf2d2bf76cd"},{"fixed":"20a3fb5e1a95caa34896853ca17a50d21c754969"},{"fixed":"b3451e6971248250312ad32dd7f63cc9f0a925f5"},{"fixed":"d0e69d9afa59b93c30294eba89b1f15f69e91105"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93804.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.3.0"},{"fixed":"6.12.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93804.json"}}],"schema_version":"1.9.0"}