CVE-2026-98702

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: reject invalid 320 MHz CSA bandwidth

The HT/VHT channel definition validator can receive a 320 MHz bandwidth indication from a received CSA frame on a non-6 GHz link. It warns for this unsupported width but continues with an uninitialized vht operation.chan width, which is then read by ieee80211 chandef vht oper(). With panic on warn enabled, this lets a received frame panic the kernel.

Reject the channel definition before entering the VHT operation conversion. This preserves the existing CSA fallback while avoiding both the warning and the uninitialized read.