CVE-2026-68193
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7925: drop TXRX_NOTIFY on non-mmio buses PKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7925_rx_check() and mt7925_queue_rx_skb() dispatch it to mt7925_mac_tx_free() on every bus. mt7925_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 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: mt7925_mac_tx_free+0x58/0x350 [mt7925_common] mt7925_rx_check+0xe2/0x130 [mt7925_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").
How to fix
- Linux Linux0c8c4cd0ca60b45c4b05a39e3769b8473d6836eb, 9cb72f67e1502aabba51aab9ac04ae7c386ee194, 9677e86a5f7d680fe280a5f8999bc57353e360d7, feeff151c83e7f0ffcdedcad5343852d23d1f6e1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | c948b5da6bbec742b433138e3e3f9537a85af2e5 ≤ v < 0c8c4cd0ca60b45c4b05a39e3769b8473d6836eb, c948b5da6bbec742b433138e3e3f9537a85af2e5 ≤ v < 9cb72f67e1502aabba51aab9ac04ae7c386ee194, c948b5da6bbec742b433138e3e3f9537a85af2e5 ≤ v < 9677e86a5f7d680fe280a5f8999bc57353e360d7, c948b5da6bbec742b433138e3e3f9537a85af2e5 ≤ v < feeff151c83e7f0ffcdedcad5343852d23d1f6e1, 6.7 | 0c8c4cd0ca60b45c4b05a39e3769b8473d6836eb, 9cb72f67e1502aabba51aab9ac04ae7c386ee194, 9677e86a5f7d680fe280a5f8999bc57353e360d7, feeff151c83e7f0ffcdedcad5343852d23d1f6e1 |
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