CVE-2026-68193wifi: mt76: mt7925: drop TXRX_NOTIFY on non-mmio buses
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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").
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from c948b5da6bbec742b433138e3e3f9537a85af2e5 before 0c8c4cd0ca60b45c4b05a39e3769b8473d6836eb; from c948b5da6bbec742b433138e3e3f9537a85af2e5 before 9cb72f67e1502aabba51aab9ac04ae7c386ee194; from c948b5da6bbec742b433138e3e3f9537a85af2e5 before 9677e86a5f7d680fe280a5f8999bc57353e360d7; from c948b5da6bbec742b433138e3e3f9537a85af2e5 before feeff151c83e7f0ffcdedcad5343852d23d1f6e1 | CNA record |
References
- https://git.kernel.org/stable/c/0c8c4cd0ca60b45c4b05a39e3769b8473d6836eb
- https://git.kernel.org/stable/c/9cb72f67e1502aabba51aab9ac04ae7c386ee194
- https://git.kernel.org/stable/c/9677e86a5f7d680fe280a5f8999bc57353e360d7
- https://git.kernel.org/stable/c/feeff151c83e7f0ffcdedcad5343852d23d1f6e1
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.