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.
Fix
Microsoft's update · Critical
- Release Notes — azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 · build 6.6.158.1-1
From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-29.
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 2
- StatusReceived → PublishedNVD modified 2026-10-19 09:17
- First seenunscoredNVD modified 2026-10-19 10:18
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 8
- 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