Bluetooth: btintel_pcie: validate device-supplied DMA indices

{
  "id": "0addd34112f24b2f99f7fc63c009f29c1c36a15879e8e5d43b7cce91884a9fd0",
  "url": "https://osv.dev/vulnerability/CVE-2026-98601",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: btintel_pcie: validate device-supplied DMA indices",
    "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.",
    "evidence": "osv:CVE-2026-98601",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.55",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98601",
      "aliases": [
        "CVE-2026-98601"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c2b636b3f788d10486a6691ad6dd3ec4c93bd78e"
                },
                {
                  "fixed": "f42cd95e679d5b78611cd2208cd1c41ad0045ffa"
                },
                {
                  "fixed": "8ec5838a35b03ac0cf3602452a369898051ffaf9"
                },
                {
                  "fixed": "b29b70bfa12133423924fcd0327c19a802f7e368"
                },
                {
                  "fixed": "37a11129345337efd6eef8e62b03b6348cd0dd8b"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98601.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.10.0"
                },
                {
                  "fixed": "6.12.112"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.55"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98601.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.318874723Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/37a11129345337efd6eef8e62b03b6348cd0dd8b",
        "https://git.kernel.org/stable/c/8ec5838a35b03ac0cf3602452a369898051ffaf9",
        "https://git.kernel.org/stable/c/b29b70bfa12133423924fcd0327c19a802f7e368",
        "https://git.kernel.org/stable/c/f42cd95e679d5b78611cd2208cd1c41ad0045ffa",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98601.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98601",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98601.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98601",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 510143,
  "published_at": "2026-10-18T15:19:13.76+00:00"
}