CVE-2026-68195

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

wifi: mt76: mt7615: drop TXRX_NOTIFY on non-mmio buses

PKTTYPETXRXNOTIFY is an mmio-only event, but mt7615rxcheck() and mt7615queuerxskb() dispatch it to mt7615mactxfree() on every bus. mt7615mactxfree() cleans the DMA tx queues with mt76queuetxcleanup(), which calls queueops->txcleanup(). Only the mmio queue ops implement that callback; on the mt7663 USB and SDIO buses it is NULL, so a TXRXNOTIFY there calls a NULL pointer in the RX worker. Same defect as the mt7921 and mt7925 patches in this series.

Drop the event on non-mmio buses via mt76ismmio(), as in commit 5683e1488aa9 ("wifi: mt76: connac: do not check WED status for non-mmio devices").