wifi: cfg80211: only group hidden BSSes with beacon entries

{
  "id": "fc05b8562b24f1ed8826337d002a0d8b7df054a70238ffdd7e71b843ff227be1",
  "url": "https://osv.dev/vulnerability/CVE-2026-98340",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: cfg80211: only group hidden BSSes with beacon entries",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: only group hidden BSSes with beacon entries When a probe response for an unknown BSS comes in, __cfg80211_bss_update() looks for an existing entry with the same BSSID and a hidden (zero-length or NUL-filled) SSID, and if it finds one it groups them, using the beacon IEs from the existing entry. But that could find another entry without a beacon, if it was also from a probe response (with SSID), so there's a group without beacon elements. If a beacon with a hidden SSID for that BSSID arrives later, cfg80211_combine_bsses() goes looking for the probe response entries that belong to it - i.e. entries with the same BSSID and channel that have no beacon IEs - and finds those two. They are already grouped with each other, so it hits its WARN_ON_ONCE(bss->pub.hidden_beacon_bss) WARN_ON_ONCE(!list_empty(&bss->hidden_list)) which are there because an entry without beacon elements is not supposed to be part of a group yet. Only combine entries when a beacon was already received, ones that are kept separate will be combined when a beacon arrives.",
    "evidence": "osv:CVE-2026-98340",
    "products": [
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        "name": {
          "value": "Kernel",
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        "prerequisites": [],
        "fixed_versions": [
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        "affected_versions": []
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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      "modified": "2026-10-28T02:30:23.629638390Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/068843ed0902c552a13860c5ec6b2ca65b57a065",
        "https://git.kernel.org/stable/c/332ea1502c46f53375cb109fa82bfaff818f3a41",
        "https://git.kernel.org/stable/c/3658093df69849daf4f813a8f087f358e13be203",
        "https://git.kernel.org/stable/c/4cd6a518ce7527284bbc9baab5fa2453a7d477c2",
        "https://git.kernel.org/stable/c/73365b81630b57e1a1f9d50dc87281797855c2ac",
        "https://git.kernel.org/stable/c/7405dd19bda4537a2843637d8d7bed1efd4776cf",
        "https://git.kernel.org/stable/c/74ed0d992f392c75e1969415527e06df3f7a4034",
        "https://git.kernel.org/stable/c/86235be788094131912e9bd8412b358d91d99f49",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98340.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98340",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98340.json"
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    "related_cves": [
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        "value": "CVE-2026-98340",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490221,
  "published_at": "2026-10-06T08:46:30.796+00:00"
}