CVE-2026-68194

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

wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses

PKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7921_rx_check() and

mt7921_queue_rx_skb() dispatch it to mt7921_mac_tx_free() on every bus.

mt7921_mac_tx_free() cleans the DMA tx queues with

mt76_queue_tx_cleanup(), which calls queue_ops->tx_cleanup(). Only the

mmio queue ops implement that callback; on USB and SDIO it is NULL, so

a TXRX_NOTIFY there calls a NULL pointer in the RX worker:

BUG: kernel NULL pointer dereference, address: 0000000000000000

RIP: 0010:0x0

Call Trace:

mt7921_mac_tx_free+0x64/0x310 [mt7921_common]

mt7921_rx_check+0x5f/0xf0 [mt7921_common]

mt76u_rx_worker+0x1b9/0x620 [mt76_usb]

Drop the event on non-mmio buses via mt76_is_mmio(), as in

commit 5683e1488aa9 ("wifi: mt76: connac: do not check WED status for

non-mmio devices").