{"id":"CVE-2026-98422","state":"PUBLISHED","title":"wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: reset the AP_VLAN tailroom counter on ifdown\n\nOn ifup, AP_VLAN interfaces get crypto_tx_tailroom_needed_cnt from\nthe AP interface, but it's never decremented again unless the AP is\nalso brought down. Thus, bringing the same AP_VLAN up again will\nincrement the counter again and eventually hit the sanity check:\n\n  WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=\n               master->crypto_tx_tailroom_needed_cnt);\n\nReset it on ifdown to avoid that.","publishedAt":"2026-10-14T13:27:50.789Z","updatedAt":"2026-10-19T09:19:15.873Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"b0b32d3f163d24ea7134380666193bf398e9dc0b","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"f6b34a7d64324faf28eedc0f8678b0f832f1cc36","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"304a874670a0b6ab5589a7f60b4af0251797b121","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"7775759e3cb35ef5a571b2d877c2a9b70a5d5f08","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"3d76b45e8432c0d75fcb9e90d92eaa3176898adf","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"4b54d01b48445b66c9e576de92b90a3a3ae7b34a","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"875835377d8d62c849b4eb03a7abfafa71d7668f","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"4504f3960dc4501c73be9f99eabda2e26e9db41e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/iface.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.1","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/iface.c"]}],"references":["https://git.kernel.org/stable/c/b0b32d3f163d24ea7134380666193bf398e9dc0b","https://git.kernel.org/stable/c/f6b34a7d64324faf28eedc0f8678b0f832f1cc36","https://git.kernel.org/stable/c/304a874670a0b6ab5589a7f60b4af0251797b121","https://git.kernel.org/stable/c/7775759e3cb35ef5a571b2d877c2a9b70a5d5f08","https://git.kernel.org/stable/c/3d76b45e8432c0d75fcb9e90d92eaa3176898adf","https://git.kernel.org/stable/c/4b54d01b48445b66c9e576de92b90a3a3ae7b34a","https://git.kernel.org/stable/c/875835377d8d62c849b4eb03a7abfafa71d7668f","https://git.kernel.org/stable/c/4504f3960dc4501c73be9f99eabda2e26e9db41e"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98422.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98422","state":"PUBLISHED","datePublished":"2026-10-14T13:27:50.789Z","dateUpdated":"2026-10-19T09:19:15.873Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.348Z"},"containers":{"cna":{"title":"wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: reset the AP_VLAN tailroom counter on ifdown\n\nOn ifup, AP_VLAN interfaces get crypto_tx_tailroom_needed_cnt from\nthe AP interface, but it's never decremented again unless the AP is\nalso brought down. Thus, bringing the same AP_VLAN up again will\nincrement the counter again and eventually hit the sanity check:\n\n  WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=\n               master->crypto_tx_tailroom_needed_cnt);\n\nReset it on ifdown to avoid that."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"b0b32d3f163d24ea7134380666193bf398e9dc0b","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"f6b34a7d64324faf28eedc0f8678b0f832f1cc36","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"304a874670a0b6ab5589a7f60b4af0251797b121","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"7775759e3cb35ef5a571b2d877c2a9b70a5d5f08","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"3d76b45e8432c0d75fcb9e90d92eaa3176898adf","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"4b54d01b48445b66c9e576de92b90a3a3ae7b34a","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"875835377d8d62c849b4eb03a7abfafa71d7668f","versionType":"git"},{"version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","status":"affected","lessThan":"4504f3960dc4501c73be9f99eabda2e26e9db41e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/iface.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.1","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/iface.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b0b32d3f163d24ea7134380666193bf398e9dc0b"},{"url":"https://git.kernel.org/stable/c/f6b34a7d64324faf28eedc0f8678b0f832f1cc36"},{"url":"https://git.kernel.org/stable/c/304a874670a0b6ab5589a7f60b4af0251797b121"},{"url":"https://git.kernel.org/stable/c/7775759e3cb35ef5a571b2d877c2a9b70a5d5f08"},{"url":"https://git.kernel.org/stable/c/3d76b45e8432c0d75fcb9e90d92eaa3176898adf"},{"url":"https://git.kernel.org/stable/c/4b54d01b48445b66c9e576de92b90a3a3ae7b34a"},{"url":"https://git.kernel.org/stable/c/875835377d8d62c849b4eb03a7abfafa71d7668f"},{"url":"https://git.kernel.org/stable/c/4504f3960dc4501c73be9f99eabda2e26e9db41e"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:19:15.873Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}