{"api_version":"1","generated_at":"2026-10-22T22:27:50+00:00","cve":"CVE-2026-98422","urls":{"html":"https://cve.report/CVE-2026-98422","api":"https://cve.report/api/cve/CVE-2026-98422.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98422","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98422"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-14 14:17:53","updated_at":"2026-10-19 10:18:47"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b0b32d3f163d24ea7134380666193bf398e9dc0b","name":"https://git.kernel.org/stable/c/b0b32d3f163d24ea7134380666193bf398e9dc0b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4504f3960dc4501c73be9f99eabda2e26e9db41e","name":"https://git.kernel.org/stable/c/4504f3960dc4501c73be9f99eabda2e26e9db41e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/304a874670a0b6ab5589a7f60b4af0251797b121","name":"https://git.kernel.org/stable/c/304a874670a0b6ab5589a7f60b4af0251797b121","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f6b34a7d64324faf28eedc0f8678b0f832f1cc36","name":"https://git.kernel.org/stable/c/f6b34a7d64324faf28eedc0f8678b0f832f1cc36","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4b54d01b48445b66c9e576de92b90a3a3ae7b34a","name":"https://git.kernel.org/stable/c/4b54d01b48445b66c9e576de92b90a3a3ae7b34a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3d76b45e8432c0d75fcb9e90d92eaa3176898adf","name":"https://git.kernel.org/stable/c/3d76b45e8432c0d75fcb9e90d92eaa3176898adf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7775759e3cb35ef5a571b2d877c2a9b70a5d5f08","name":"https://git.kernel.org/stable/c/7775759e3cb35ef5a571b2d877c2a9b70a5d5f08","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/875835377d8d62c849b4eb03a7abfafa71d7668f","name":"https://git.kernel.org/stable/c/875835377d8d62c849b4eb03a7abfafa71d7668f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98422","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98422","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 b0b32d3f163d24ea7134380666193bf398e9dc0b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 f6b34a7d64324faf28eedc0f8678b0f832f1cc36 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 304a874670a0b6ab5589a7f60b4af0251797b121 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 7775759e3cb35ef5a571b2d877c2a9b70a5d5f08 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 3d76b45e8432c0d75fcb9e90d92eaa3176898adf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 4b54d01b48445b66c9e576de92b90a3a3ae7b34a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 875835377d8d62c849b4eb03a7abfafa71d7668f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 4504f3960dc4501c73be9f99eabda2e26e9db41e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.271 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.222 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.189 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.54 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.8 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/mac80211/iface.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b0b32d3f163d24ea7134380666193bf398e9dc0b","status":"affected","version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","versionType":"git"},{"lessThan":"f6b34a7d64324faf28eedc0f8678b0f832f1cc36","status":"affected","version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","versionType":"git"},{"lessThan":"304a874670a0b6ab5589a7f60b4af0251797b121","status":"affected","version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","versionType":"git"},{"lessThan":"7775759e3cb35ef5a571b2d877c2a9b70a5d5f08","status":"affected","version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","versionType":"git"},{"lessThan":"3d76b45e8432c0d75fcb9e90d92eaa3176898adf","status":"affected","version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","versionType":"git"},{"lessThan":"4b54d01b48445b66c9e576de92b90a3a3ae7b34a","status":"affected","version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","versionType":"git"},{"lessThan":"875835377d8d62c849b4eb03a7abfafa71d7668f","status":"affected","version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","versionType":"git"},{"lessThan":"4504f3960dc4501c73be9f99eabda2e26e9db41e","status":"affected","version":"f9dca80b98caac8b4bfb43a2edf1e9f877ccf322","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/mac80211/iface.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.1"},{"lessThan":"4.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.271","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.222","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.189","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.54","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.271","versionStartIncluding":"4.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.222","versionStartIncluding":"4.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.189","versionStartIncluding":"4.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"4.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"4.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.54","versionStartIncluding":"4.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.8","versionStartIncluding":"4.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"4.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-10-19T09:19:15.873Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98422","datePublished":"2026-10-14T13:27:50.789Z","dateReserved":"2026-09-25T10:25:14.348Z","dateUpdated":"2026-10-19T09:19:15.873Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-14 14:17:53","lastModifiedDate":"2026-10-19 10:18:47","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98422","Ordinal":"1","Title":"wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown","CVE":"CVE-2026-98422","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98422","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown"}]}}}