CVE-2026-98601 (GCVE-0-2026-98601)
Vulnerability from cvelistv5
Published
2026-10-18 15:19
Modified
2026-10-19 09:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btintel_pcie: validate device-supplied DMA indices In btintel_pcie_msix_rx_handle(), the driver processes RX completion descriptors (urbd1) written by the PCIe device into DMA-coherent memory. urbd1->frbd_tag (a 16-bit field fully controlled by the device firmware via DMA) is used directly as an array index into rxq->bufs[] without any bounds check. rxq->bufs[] has only BTINTEL_PCIE_RX_DESCS_COUNT (64) entries, while frbd_tag can be any value 0-65535. A malicious or malfunctioning device can write an out-of-range frbd_tag, causing the driver to dereference an out-of-bounds data_buf pointer. Additionally, cr_hia is read from a DMA-shared index array also writable by the device; if the device sets cr_hia >= rxq->count, the while-loop never terminates because cr_tia is wrapped via modulo rxq->count and can never equal an out-of-range cr_hia. Add bounds validation for cr_hia and frbd_tag in the RX path, and cr_hia in the TX path. Log invalid values with bt_dev_err before returning.
References
Impacted products
Vendor Product Version
Linux Linux Version: c2b636b3f788d10486a6691ad6dd3ec4c93bd78e
Version: c2b636b3f788d10486a6691ad6dd3ec4c93bd78e
Version: c2b636b3f788d10486a6691ad6dd3ec4c93bd78e
Version: c2b636b3f788d10486a6691ad6dd3ec4c93bd78e
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/btintel_pcie.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f42cd95e679d5b78611cd2208cd1c41ad0045ffa",
              "status": "affected",
              "version": "c2b636b3f788d10486a6691ad6dd3ec4c93bd78e",
              "versionType": "git"
            },
            {
              "lessThan": "8ec5838a35b03ac0cf3602452a369898051ffaf9",
              "status": "affected",
              "version": "c2b636b3f788d10486a6691ad6dd3ec4c93bd78e",
              "versionType": "git"
            },
            {
              "lessThan": "b29b70bfa12133423924fcd0327c19a802f7e368",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "c2b636b3f788d10486a6691ad6dd3ec4c93bd78e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/bluetooth/btintel_pcie.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.55",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btintel_pcie: validate device-supplied DMA indices\n\nIn btintel_pcie_msix_rx_handle(), the driver processes RX completion\ndescriptors (urbd1) written by the PCIe device into DMA-coherent memory.\nurbd1-\u003efrbd_tag (a 16-bit field fully controlled by the device firmware\nvia DMA) is used directly as an array index into rxq-\u003ebufs[] without any\nbounds check. rxq-\u003ebufs[] has only BTINTEL_PCIE_RX_DESCS_COUNT (64)\nentries, while frbd_tag can be any value 0-65535. A malicious or\nmalfunctioning device can write an out-of-range frbd_tag, causing the\ndriver to dereference an out-of-bounds data_buf pointer.\n\nAdditionally, cr_hia is read from a DMA-shared index array also writable\nby the device; if the device sets cr_hia \u003e= rxq-\u003ecount, the while-loop\nnever terminates because cr_tia is wrapped via modulo rxq-\u003ecount and can\nnever equal an out-of-range cr_hia.\n\nAdd bounds validation for cr_hia and frbd_tag in the RX path, and cr_hia\nin the TX path. Log invalid values with bt_dev_err before returning."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:22:28.028Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f42cd95e679d5b78611cd2208cd1c41ad0045ffa"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ec5838a35b03ac0cf3602452a369898051ffaf9"
        },
        {
          "url": "https://git.kernel.org/stable/c/b29b70bfa12133423924fcd0327c19a802f7e368"
        },
        {
          "url": "https://git.kernel.org/stable/c/37a11129345337efd6eef8e62b03b6348cd0dd8b"
        }
      ],
      "title": "Bluetooth: btintel_pcie: validate device-supplied DMA indices",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98601",
    "datePublished": "2026-10-18T15:19:13.760Z",
    "dateReserved": "2026-09-25T10:25:14.359Z",
    "dateUpdated": "2026-10-19T09:22:28.028Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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