What’s Vulnerable › Vulnerabilities

CVE-2026-68195: wifi: mt76: mt7615: drop TXRX_NOTIFY on non-mmio buses

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-10 · updated 2026-08-19

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").

Affected products

• Linux kernel: 5.8 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1a099d630b8667fa622662b85e35a0ef659fb343
• https://git.kernel.org/stable/c/39afc46c0243d10b7795e6e6cf4ae91f41732120
• https://git.kernel.org/stable/c/664f8bbc61e45e062679da512bf12f8f6fb26a1b
• https://git.kernel.org/stable/c/88c98ef247a3126fea9bbbda953a18a2f36c3ea7
• https://git.kernel.org/stable/c/a0b3e8d8726c3830102a18946c766c94c953c7f2
• https://git.kernel.org/stable/c/ab4d213393e846baa6437497f94dda7553cbeda7
• https://git.kernel.org/stable/c/b2ab73b8123ce6cf2bc32634bfee4928676ffa66
• https://git.kernel.org/stable/c/f2a72f47c5fb4ba6887e85bbe809d7e5b318d9d5

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