CVE-2026-68193

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: mt76: mt7925: drop TXRX_NOTIFY on non-mmio buses<br /> <br /> PKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7925_rx_check() and<br /> mt7925_queue_rx_skb() dispatch it to mt7925_mac_tx_free() on every bus.<br /> mt7925_mac_tx_free() cleans the DMA tx queues with<br /> mt76_queue_tx_cleanup(), which calls queue_ops-&gt;tx_cleanup(). Only the<br /> mmio queue ops implement that callback; on USB it is NULL, so a<br /> TXRX_NOTIFY there calls a NULL pointer in the RX worker:<br /> <br /> BUG: kernel NULL pointer dereference, address: 0000000000000000<br /> RIP: 0010:0x0<br /> Call Trace:<br /> mt7925_mac_tx_free+0x58/0x350 [mt7925_common]<br /> mt7925_rx_check+0xe2/0x130 [mt7925_common]<br /> mt76u_rx_worker+0x1b9/0x620 [mt76_usb]<br /> <br /> Drop the event on non-mmio buses via mt76_is_mmio(), as in<br /> commit 5683e1488aa9 ("wifi: mt76: connac: do not check WED status for<br /> non-mmio devices").