CVE-2026-98292

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btmtksdio, btmtkuart: validate WMT event length before struct access btmtksdio.c and btmtkuart.c cast a received WMT event straight to struct btmtk_hci_wmt_evt and read its op/flag fields without checking the event is long enough to contain them, unlike btmtk.c. The FUNC_CTRL case then further casts to struct btmtk_hci_wmt_evt_funcc and reads its 2-byte status field, again without a length check. Firmware that sends a short or malformed WMT event makes both drivers read past the end of the received SKB. Mirror btmtk.c: validate the base WMT header with skb_pull_data() before touching any of its fields, and when a FUNC_CTRL event turns out to be the short, header-only form (a plain enable/disable ack with no status word), decode the result from the header's own flag byte instead (0 = success, otherwise failure). Verified setup on MT7920, MT7921, MT7922 and MT7925: no regression.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-06 09:18:19.603000

Last modified

2026-10-19 10:18:30.940000

View original CVE JSON

{
  "id": "CVE-2026-98292",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-06T09:18:19.603",
  "lastModified": "2026-10-19T10:18:30.940",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btmtksdio, btmtkuart: validate WMT event length before struct access\n\nbtmtksdio.c and btmtkuart.c cast a received WMT event straight to\nstruct btmtk_hci_wmt_evt and read its op/flag fields without checking\nthe event is long enough to contain them, unlike btmtk.c. The\nFUNC_CTRL case then further casts to struct btmtk_hci_wmt_evt_funcc\nand reads its 2-byte status field, again without a length check.\nFirmware that sends a short or malformed WMT event makes both drivers\nread past the end of the received SKB.\n\nMirror btmtk.c: validate the base WMT header with skb_pull_data()\nbefore touching any of its fields, and when a FUNC_CTRL event turns\nout to be the short, header-only form (a plain enable/disable ack\nwith no status word), decode the result from the header's own flag\nbyte instead (0 = success, otherwise failure).\n\nVerified setup on MT7920, MT7921, MT7922 and MT7925: no regression."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/bluetooth/btmtksdio.c",
            "drivers/bluetooth/btmtkuart.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "e0b67035a90b58d01f911fed77b6e3da153da66e",
              "lessThan": "5a5cfd8488c97e1b8939515429fe4c81e9f2df4f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e0b67035a90b58d01f911fed77b6e3da153da66e",
              "lessThan": "8879e3e0a84a86954c855caceead4867e74a9a27",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/bluetooth/btmtksdio.c",
            "drivers/bluetooth/btmtkuart.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.1",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.1",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.8",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/5a5cfd8488c97e1b8939515429fe4c81e9f2df4f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8879e3e0a84a86954c855caceead4867e74a9a27",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}