CVE-2026-98340 is a vulnerability in Linux Kernel
Published on October 6, 2026
wifi: cfg80211: only group hidden BSSes with beacon entries
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.
Products Associated with CVE-2026-98340
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Affected Versions
Linux:- Version 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc and below 4cd6a518ce7527284bbc9baab5fa2453a7d477c2 is affected.
- Version 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc and below 74ed0d992f392c75e1969415527e06df3f7a4034 is affected.
- Version 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc and below 3658093df69849daf4f813a8f087f358e13be203 is affected.
- Version 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc and below 73365b81630b57e1a1f9d50dc87281797855c2ac is affected.
- Version 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc and below 7405dd19bda4537a2843637d8d7bed1efd4776cf is affected.
- Version 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc and below 86235be788094131912e9bd8412b358d91d99f49 is affected.
- Version 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc and below 332ea1502c46f53375cb109fa82bfaff818f3a41 is affected.
- Version 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc and below 068843ed0902c552a13860c5ec6b2ca65b57a065 is affected.
- Version 3.9 is affected.
- Before 3.9 is unaffected.
- Version 5.10.271, <= 5.10.* is unaffected.
- Version 5.15.222, <= 5.15.* is unaffected.
- Version 6.1.189, <= 6.1.* is unaffected.
- Version 6.6.158, <= 6.6.* is unaffected.
- Version 6.12.112, <= 6.12.* is unaffected.
- Version 6.18.54, <= 6.18.* is unaffected.
- Version 7.2.8, <= 7.2.* is unaffected.
- Version 7.3-rc4, <= * is unaffected.