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CVE-2026-98340

Unknown

Last modified

CVE-2026-98340 is a vulnerability of currently unknown severity. 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.

Description

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc, < 4cd6a518ce7527284bbc9baab5fa2453a7d477c2; >= 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc, < 74ed0d992f392c75e1969415527e06df3f7a4034; >= 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc, < 3658093df69849daf4f813a8f087f358e13be203; >= 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc, < 73365b81630b57e1a1f9d50dc87281797855c2ac; >= 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc, < 7405dd19bda4537a2843637d8d7bed1efd4776cf; >= 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc, < 86235be788094131912e9bd8412b358d91d99f49; >= 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc, < 332ea1502c46f53375cb109fa82bfaff818f3a41; >= 4593c4cbe1c96b3995727dc42f6aa103f4ff5afc, < 068843ed0902c552a13860c5ec6b2ca65b57a065
LinuxLinux3.9

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98340?
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.
How severe is CVE-2026-98340?
Severity scoring for CVE-2026-98340 is pending analysis.
How do I fix CVE-2026-98340?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST