{"id":"CVE-2026-98422","title":"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 decrem…","summary":"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 decrem…","severity":"medium","published":"2026-10-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T14:17:53.737","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98422","references":[{"url":"https://git.kernel.org/stable/c/304a874670a0b6ab5589a7f60b4af0251797b121","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3d76b45e8432c0d75fcb9e90d92eaa3176898adf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4504f3960dc4501c73be9f99eabda2e26e9db41e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4b54d01b48445b66c9e576de92b90a3a3ae7b34a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7775759e3cb35ef5a571b2d877c2a9b70a5d5f08","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/875835377d8d62c849b4eb03a7abfafa71d7668f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b0b32d3f163d24ea7134380666193bf398e9dc0b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f6b34a7d64324faf28eedc0f8678b0f832f1cc36","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98422.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98422"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2552230"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98422"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98422"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98422.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-10-14T15:36:13.989Z","vendor":"Linux","product":"Linux","affected":["Linux >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 < b0b32d3f163d24ea7134380666193bf398e9dc0b","Linux >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 < f6b34a7d64324faf28eedc0f8678b0f832f1cc36","Linux >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 < 304a874670a0b6ab5589a7f60b4af0251797b121","Linux >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 < 7775759e3cb35ef5a571b2d877c2a9b70a5d5f08","Linux >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 < 3d76b45e8432c0d75fcb9e90d92eaa3176898adf","Linux >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 < 4b54d01b48445b66c9e576de92b90a3a3ae7b34a","Linux >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 < 875835377d8d62c849b4eb03a7abfafa71d7668f","Linux >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 < 4504f3960dc4501c73be9f99eabda2e26e9db41e","Linux 4.1"],"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-617"],"epss":0.0022,"epssPercentile":0.12449,"slug":"CVE-2026-98422","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98422.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":222233,"id":"CVE-2026-98422","ts":1792065145494,"field":"cvss","old":null,"new":"5.5"},{"seq":222232,"id":"CVE-2026-98422","ts":1792065145494,"field":"severity","old":"none","new":"medium"}]}