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FKIE_CVE-2026-68194

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-19 17:20
Severity
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7003a2cbddd7917933c1f169c7874cfa6ab852c3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7921/mac.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7003a2cbddd7917933c1f169c7874cfa6ab852c3",
              "status": "affected",
              "version": "48fab5bbef4092d925ab3214773ad12e68807223",
              "versionType": "git"
            },
            {
              "lessThan": "ef2ee5f820c3ef87643b51e960c20b4a14d8336b",
              "status": "affected",
              "version": "48fab5bbef4092d925ab3214773ad12e68807223",
              "versionType": "git"
            },
            {
              "lessThan": "ecf995b828191829ba4a87169bccabcbeb5c9c32",
              "status": "affected",
              "version": "48fab5bbef4092d925ab3214773ad12e68807223",
              "versionType": "git"
            },
            {
              "lessThan": "263816e92e8d66c81c98ccab2b5d2191ed08ec71",
              "status": "affected",
              "version": "48fab5bbef4092d925ab3214773ad12e68807223",
              "versionType": "git"
            },
            {
              "lessThan": "24475d2ddc8d8dfd82f4d2be0d951401f86911a6",
              "status": "affected",
              "version": "48fab5bbef4092d925ab3214773ad12e68807223",
              "versionType": "git"
            },
            {
              "lessThan": "da4082e91acabc1498611ed8ccc53f0610baefc6",
              "status": "affected",
              "version": "48fab5bbef4092d925ab3214773ad12e68807223",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7921/mac.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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\")."
    }
  ],
  "id": "CVE-2026-68194",
  "lastModified": "2026-08-19T17:20:35.577",
  "metrics": {},
  "published": "2026-08-10T13:20:06.783",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7003a2cbddd7917933c1f169c7874cfa6ab852c3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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