{"id":"CVE-2026-98340","summary":"wifi: cfg80211: only group hidden BSSes with beacon entries","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: only group hidden BSSes with beacon entries\n\nWhen a probe response for an unknown BSS comes in, __cfg80211_bss_update()\nlooks for an existing entry with the same BSSID and a hidden (zero-length\nor NUL-filled) SSID, and if it finds one it groups them, using the beacon\nIEs from the existing entry.\n\nBut that could find another entry without a beacon, if it was also from a\nprobe response (with SSID), so there's a group without beacon elements.\n\nIf a beacon with a hidden SSID for that BSSID arrives later,\ncfg80211_combine_bsses() goes looking for the probe response entries that\nbelong to it - i.e. entries with the same BSSID and channel that have no\nbeacon IEs - and finds those two. They are already grouped with each\nother, so it hits its\n\n  WARN_ON_ONCE(bss-\u003epub.hidden_beacon_bss)\n  WARN_ON_ONCE(!list_empty(&bss-\u003ehidden_list))\n\nwhich are there because an entry without beacon elements is not supposed\nto be part of a group yet.\n\nOnly combine entries when a beacon was already received, ones that are\nkept separate will be combined when a beacon arrives.","modified":"2026-10-08T02:52:57.998567416Z","published":"2026-10-06T08:46:30.796Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98340.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/068843ed0902c552a13860c5ec6b2ca65b57a065"},{"type":"WEB","url":"https://git.kernel.org/stable/c/332ea1502c46f53375cb109fa82bfaff818f3a41"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3658093df69849daf4f813a8f087f358e13be203"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4cd6a518ce7527284bbc9baab5fa2453a7d477c2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/73365b81630b57e1a1f9d50dc87281797855c2ac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7405dd19bda4537a2843637d8d7bed1efd4776cf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/74ed0d992f392c75e1969415527e06df3f7a4034"},{"type":"WEB","url":"https://git.kernel.org/stable/c/86235be788094131912e9bd8412b358d91d99f49"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98340.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98340"},{"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":"4593c4cbe1c96b3995727dc42f6aa103f4ff5afc"},{"fixed":"4cd6a518ce7527284bbc9baab5fa2453a7d477c2"},{"fixed":"74ed0d992f392c75e1969415527e06df3f7a4034"},{"fixed":"3658093df69849daf4f813a8f087f358e13be203"},{"fixed":"73365b81630b57e1a1f9d50dc87281797855c2ac"},{"fixed":"7405dd19bda4537a2843637d8d7bed1efd4776cf"},{"fixed":"86235be788094131912e9bd8412b358d91d99f49"},{"fixed":"332ea1502c46f53375cb109fa82bfaff818f3a41"},{"fixed":"068843ed0902c552a13860c5ec6b2ca65b57a065"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98340.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.9.0"},{"fixed":"5.10.271"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.54"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98340.json"}}],"schema_version":"1.9.0"}