CVE-2026-68194 (GCVE-0-2026-68194)
Vulnerability from cvelistv5
Published
2026-08-10 12:00
Modified
2026-08-19 16:31
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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").
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 48fab5bbef4092d925ab3214773ad12e68807223 Version: 48fab5bbef4092d925ab3214773ad12e68807223 Version: 48fab5bbef4092d925ab3214773ad12e68807223 Version: 48fab5bbef4092d925ab3214773ad12e68807223 Version: 48fab5bbef4092d925ab3214773ad12e68807223 Version: 48fab5bbef4092d925ab3214773ad12e68807223 |
||
{
"containers": {
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"product": "Linux",
"programFiles": [
"drivers/net/wireless/mediatek/mt76/mt7921/mac.c"
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"vendor": "Linux",
"versions": [
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},
{
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"version": "0",
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"version": "6.1.183",
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"version": "6.6.148",
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"status": "unaffected",
"version": "6.12.101",
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{
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"version": "6.18.42",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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"negate": false,
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses\n\nPKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7921_rx_check() and\nmt7921_queue_rx_skb() dispatch it to mt7921_mac_tx_free() on every bus.\nmt7921_mac_tx_free() cleans the DMA tx queues with\nmt76_queue_tx_cleanup(), which calls queue_ops-\u003etx_cleanup(). Only the\nmmio queue ops implement that callback; on USB and SDIO it is NULL, so\na TXRX_NOTIFY there calls a NULL pointer in the RX worker:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n RIP: 0010:0x0\n Call Trace:\n mt7921_mac_tx_free+0x64/0x310 [mt7921_common]\n mt7921_rx_check+0x5f/0xf0 [mt7921_common]\n mt76u_rx_worker+0x1b9/0x620 [mt76_usb]\n\nDrop the event on non-mmio buses via mt76_is_mmio(), as in\ncommit 5683e1488aa9 (\"wifi: mt76: connac: do not check WED status for\nnon-mmio devices\")."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:31:09.017Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/7003a2cbddd7917933c1f169c7874cfa6ab852c3"
},
{
"url": "https://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b"
},
{
"url": "https://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32"
},
{
"url": "https://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71"
},
{
"url": "https://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6"
},
{
"url": "https://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6"
}
],
"title": "wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68194",
"datePublished": "2026-08-10T12:00:12.245Z",
"dateReserved": "2026-07-30T09:28:09.374Z",
"dateUpdated": "2026-08-19T16:31:09.017Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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