GHSA-84VW-9582-FHPX
Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-98340"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-06T09:18:26Z",
"severity": null
},
"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\u0027s 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(\u0026bss-\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.",
"id": "GHSA-84vw-9582-fhpx",
"modified": "2026-10-06T09:31:36Z",
"published": "2026-10-06T09:31:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98340"
},
{
"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"
}
],
"schema_version": "1.4.0",
"severity": []
}
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