Bluetooth: ISO: Copy BASE if service data matches EIR_BAA_SERVICE_UUID

{
  "id": "95a6f6b8eaba3caceec7676b688c6f8a46d6c8c4262c05dec663477f74daaddf",
  "url": "https://www.cve.org/CVERecord?id=CVE-2023-7356",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: ISO: Copy BASE if service data matches EIR_BAA_SERVICE_UUID",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: Copy BASE if service data matches EIR_BAA_SERVICE_UUID Copy the content of a Periodic Advertisement Report to BASE only if the service UUID is Basic Audio Announcement Service UUID.",
    "evidence": "cve:CVE-2023-7356",
    "products": [
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-7356",
      "aliases": [
        "CVE-2023-7356"
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "version": "3.1",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - A BLE Periodic Advertising Report supplies ev3->length and ev3->data through hci_recv_frame()→hci_event_packet()→hci_le_per_adv_report_evt()→hci_proto_connect_ind()→iso_connect_ind(); exploitation therefore requires Bluetooth radio proximity.\nAC:L - A single matched report with length 251–255 overwrites padding and up to five low bytes of iso_pinfo.conn; iso_connect_ind() performs the memcpy deterministically, with no race or condition outside the broadcaster's control.\nPR:N - hci_le_per_adv_report_evt() performs no pairing, authentication, or authorization check before calling iso_connect_ind(); iso_match_sync_handle_pa_report() only matches the unauthenticated report to an existing periodic-advertising sync.\nUI:N - Once an ISO broadcast-sink listener is synchronized, receipt of the crafted periodic report invokes iso_connect_ind() automatically; no victim action is required for the overflowing report.\nS:U - The overwrite corrupts iso_pinfo and its iso_conn pointer within the same host kernel security authority; it does not cross a VM, IOMMU, or other security boundary.\nC:H - base[248] immediately precedes the live conn pointer, and the overflow can redirect later conn->hcon reads in iso_sock_get_qos() and related paths, providing exploitable kernel-pointer corruption capable of arbitrary memory disclosure.\nI:H - The unchecked memcpy() writes beyond iso_pinfo.base into low bytes of iso_pinfo.conn; subsequent writes and lock operations through that corrupted pointer in iso_chan_del() and timer helpers can enable arbitrary kernel-memory corruption or control-flow hijacking.\nA:H - A corrupted iso_pinfo.conn is dereferenced by iso_sock_clear_timer(), iso_sock_get_qos(), send, and close paths, allowing an unauthenticated broadcaster to trigger a kernel oops or panic."
            }
          ]
        }
      ],
      "affected": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "e4cfffb5ebc80820f46cf16a6fa5be1b436bdf2d",
              "lessThan": "ba25efe15e8fd909884e113a86c6ccd07d88256e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9c0826310bfb784c9bac7d1d9454e304185446c5",
              "lessThan": "927ef409f713929dea2b9a5ed5bb65e712be0050",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9c0826310bfb784c9bac7d1d9454e304185446c5",
              "lessThan": "f4da3ee15de9944482382181329bb6d7335ca003",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.1.159",
              "lessThan": "6.1.178",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.6",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.7",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "defaultStatus": "affected"
        }
      ],
      "modified": "2026-10-26T06:55:41.493Z",
      "provider": "cve",
      "references": [
        "https://git.kernel.org/stable/c/ba25efe15e8fd909884e113a86c6ccd07d88256e",
        "https://git.kernel.org/stable/c/927ef409f713929dea2b9a5ed5bb65e712be0050",
        "https://git.kernel.org/stable/c/f4da3ee15de9944482382181329bb6d7335ca003"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "shortName": "Linux",
          "dateUpdated": "2026-10-26T06:55:41.493Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-7356",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 263329,
  "published_at": "2026-10-21T14:59:38.724+00:00"
}