CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's handling of the PKT_TYPE_TXRX_NOTIFY event for the mt7615 wireless driver, which incorrectly processes this event on non-MMIO buses, leading to potential NULL pointer dereferences in the RX worker. This flaw could result in system instability or crashes when using affected devices, particularly those utilizing USB and SDIO buses. Organizations utilizing Linux systems with mt7615 drivers should prioritize patching to mitigate the risk of exploitation.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7615: drop TXRX_NOTIFY on non-mmio buses PKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7615_rx_check() and mt7615_queue_rx_skb() dispatch it to mt7615_mac_tx_free() on every bus. mt7615_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 the mt7663 USB and SDIO buses it is NULL, so a TXRX_NOTIFY 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 mt76_is_mmio(), as in commit 5683e1488aa9 ("wifi: mt76: connac: do not check WED status for non-mmio devices").