{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89583",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89583"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "Bluetooth: eir: Fix OOB read in eir_get_service_data()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: eir: Fix OOB read in eir_get_service_data()\n\neir_get_service_data() walks the advertising data for a Service Data\nfield with a matching UUID.  On a mismatch it advances:\n\n    eir += dlen;\n    eir_len -= dlen;\n\neir_get_data() reports dlen as the field's data length, but the field\nspans dlen + 2 bytes once its length and type bytes count, and more\nwhen non-Service-Data fields were skipped to reach it.  The pointer\nlands correctly on the next field.  eir_len does not, and the shortfall\ncompounds across fields until eir_get_data() reads the length and type\nbytes of a \"field\" past the end of the buffer.\n\nFor an ISO broadcast sink that buffer is hcon->le_per_adv_data[], filled\nfrom the periodic advertising reports of a remote broadcaster.  A PA\npayload packed with mismatching Service Data fields walks off the array\ninto the rest of struct hci_conn.  A drifted field that matches the BAA\nUUID puts those bytes in iso_pi(sk)->base, where user space reads them\nback with getsockopt(BT_ISO_BASE).\n\nRecompute eir_len from the end of the buffer each iteration.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89583"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b6902adf81ea2ce14b1040dd97b6980050a8125a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1a28aae7f1fc8c06c0d02f153541be4fc7bacb74"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/815fc98c227a78cbd93d4c29f2833705b7c2bc0f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c21fa79301d7d6ac0a4ec6c51e8ba10beaa08c50"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bb56e97bd67614238c1c0a4084704ccadbb875b4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4beb198bc59b242404a47c21990bc84165052c8a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The OOB read is in eir_get_service_data() parsing LE periodic advertising. An ISO broadcast sink copies HCI_EV_LE_PER_ADV_REPORT payloads from a remote broadcaster into hcon->le_per_adv_data[] via iso_connect_ind(), which is an adjacent Bluetooth radio path, not IP or a local-only syscall.\nAC:L - An in-range attacker fully controls the PA payload and can pack mismatching Service Data fields to inflate eir_len, then a trailing BAA-UUID field whose declared length extends past the buffer; triggering is deterministic with no race or layout the attacker cannot influence.\nPR:N - Periodic advertising is unauthenticated connectionless LE traffic; iso_connect_ind() parses PA reports with no pairing, HCI authentication, or capability check, and iso_sock_create() has no CAP_NET_ADMIN gate, so the attacker needs no Linux credentials on the victim.\nUI:N - LE Audio/Auracast stacks keep ISO broadcast-sink listeners during normal operation; once PA sync exists, iso_connect_ind() parses each HCI_EV_LE_PER_ADV_REPORT automatically and returns HCI_LM_ACCEPT without further user clicks, pairing, or setup.\nS:U - The out-of-bounds read of struct hci_conn and the copy into the ISO socket BASE buffer remain in the host kernel Bluetooth stack and do not cross a VM, container, or IOMMU security boundary.\nC:H - Inflated eir_len lets a matching BAA (0x1851) Service Data field extend past the 1650-byte le_per_adv_data[] into the rest of hci_conn; up to BASE_MAX_LENGTH (248) bytes are memcpy'd into iso_pi(sk)->base and returned via getsockopt(BT_ISO_BASE), leaking kernel pointers and adjacent object bytes.\nI:N - This is an out-of-bounds read only; the memcpy into iso_pi(sk)->base is capped by BASE_MAX_LENGTH, and there is no out-of-bounds write, use-after-free, or control-flow hijack primitive.\nA:H - Continuing the EIR walk with an overstated remaining length can read hundreds of bytes past le_per_adv_data[] into adjacent slab or unmapped memory, causing a kernel oops or KASAN panic that the attacker can retrigger with further PA reports."
    }
  }
}