wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses
Summary
| CVE | CVE-2026-68194 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-10 13:20:06 UTC |
| Updated | 2026-08-19 17:20:35 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses PKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7921_rx_check() and mt7921_queue_rx_skb() dispatch it to mt7921_mac_tx_free() on every bus. mt7921_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 and SDIO 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: mt7921_mac_tx_free+0x64/0x310 [mt7921_common] mt7921_rx_check+0x5f/0xf0 [mt7921_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 0.101910000 (date 2026-08-19)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 48fab5bbef4092d925ab3214773ad12e68807223 7003a2cbddd7917933c1f169c7874cfa6ab852c3 git | Not specified |
| CNA | Linux | Linux | affected 48fab5bbef4092d925ab3214773ad12e68807223 ef2ee5f820c3ef87643b51e960c20b4a14d8336b git | Not specified |
| CNA | Linux | Linux | affected 48fab5bbef4092d925ab3214773ad12e68807223 ecf995b828191829ba4a87169bccabcbeb5c9c32 git | Not specified |
| CNA | Linux | Linux | affected 48fab5bbef4092d925ab3214773ad12e68807223 263816e92e8d66c81c98ccab2b5d2191ed08ec71 git | Not specified |
| CNA | Linux | Linux | affected 48fab5bbef4092d925ab3214773ad12e68807223 24475d2ddc8d8dfd82f4d2be0d951401f86911a6 git | Not specified |
| CNA | Linux | Linux | affected 48fab5bbef4092d925ab3214773ad12e68807223 da4082e91acabc1498611ed8ccc53f0610baefc6 git | Not specified |
| CNA | Linux | Linux | affected 5.16 | Not specified |
| CNA | Linux | Linux | unaffected 5.16 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.183 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.148 6.6.* 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
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7003a2cbddd7917933c1f169c7874cfa6ab852c3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.