{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "48fab5bbef4092d925ab3214773ad12e68807223"
            },
            {
              "fixed": "7003a2cbddd7917933c1f169c7874cfa6ab852c3"
            },
            {
              "fixed": "ef2ee5f820c3ef87643b51e960c20b4a14d8336b"
            },
            {
              "fixed": "ecf995b828191829ba4a87169bccabcbeb5c9c32"
            },
            {
              "fixed": "263816e92e8d66c81c98ccab2b5d2191ed08ec71"
            },
            {
              "fixed": "24475d2ddc8d8dfd82f4d2be0d951401f86911a6"
            },
            {
              "fixed": "da4082e91acabc1498611ed8ccc53f0610baefc6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.183"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.148"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.101"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.42"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68194.json"
  },
  "details": "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",
  "modified": "2026-08-21T03:30:09.567221379Z",
  "published": "2026-08-10T12:00:12.245Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7003a2cbddd7917933c1f169c7874cfa6ab852c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68194.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68194"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses"
}