CVE-2026-98340 in Linux
Sumário
de MITRE • 06/10/2026
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.
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