wifi: mt76: mt7925: drop TXRX_NOTIFY on non-mmio buses

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68193
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:06 UTC
Updated2026-08-17 05:18:21 UTC
DescriptionIn 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").

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.101670000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c948b5da6bbec742b433138e3e3f9537a85af2e5 0c8c4cd0ca60b45c4b05a39e3769b8473d6836eb git Not specified
CNA Linux Linux affected c948b5da6bbec742b433138e3e3f9537a85af2e5 9cb72f67e1502aabba51aab9ac04ae7c386ee194 git Not specified
CNA Linux Linux affected c948b5da6bbec742b433138e3e3f9537a85af2e5 9677e86a5f7d680fe280a5f8999bc57353e360d7 git Not specified
CNA Linux Linux affected c948b5da6bbec742b433138e3e3f9537a85af2e5 feeff151c83e7f0ffcdedcad5343852d23d1f6e1 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/feeff151c83e7f0ffcdedcad5343852d23d1f6e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9cb72f67e1502aabba51aab9ac04ae7c386ee194 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0c8c4cd0ca60b45c4b05a39e3769b8473d6836eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9677e86a5f7d680fe280a5f8999bc57353e360d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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