CVE-2026-89583 (GCVE-0-2026-89583)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-19 08:49
Severity ?
8.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: eir: Fix OOB read in eir_get_service_data() eir_get_service_data() walks the advertising data for a Service Data field with a matching UUID. On a mismatch it advances: eir += dlen; eir_len -= dlen; eir_get_data() reports dlen as the field's data length, but the field spans dlen + 2 bytes once its length and type bytes count, and more when non-Service-Data fields were skipped to reach it. The pointer lands correctly on the next field. eir_len does not, and the shortfall compounds across fields until eir_get_data() reads the length and type bytes of a "field" past the end of the buffer. For an ISO broadcast sink that buffer is hcon->le_per_adv_data[], filled from the periodic advertising reports of a remote broadcaster. A PA payload packed with mismatching Service Data fields walks off the array into the rest of struct hci_conn. A drifted field that matches the BAA UUID puts those bytes in iso_pi(sk)->base, where user space reads them back with getsockopt(BT_ISO_BASE). Recompute eir_len from the end of the buffer each iteration.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a
Version: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a
Version: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a
Version: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a
Version: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a
Version: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/eir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/eir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "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": "6.1.188",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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-\u003ele_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)-\u003ebase, where user space reads them\nback with getsockopt(BT_ISO_BASE).\n\nRecompute eir_len from the end of the buffer each iteration."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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-\u003ele_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\u0027d into iso_pi(sk)-\u003ebase 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)-\u003ebase 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:49:16.094Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b6902adf81ea2ce14b1040dd97b6980050a8125a"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a28aae7f1fc8c06c0d02f153541be4fc7bacb74"
        },
        {
          "url": "https://git.kernel.org/stable/c/815fc98c227a78cbd93d4c29f2833705b7c2bc0f"
        },
        {
          "url": "https://git.kernel.org/stable/c/c21fa79301d7d6ac0a4ec6c51e8ba10beaa08c50"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb56e97bd67614238c1c0a4084704ccadbb875b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/4beb198bc59b242404a47c21990bc84165052c8a"
        }
      ],
      "title": "Bluetooth: eir: Fix OOB read in eir_get_service_data()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89583",
    "datePublished": "2026-09-11T19:44:49.094Z",
    "dateReserved": "2026-09-11T19:38:34.728Z",
    "dateUpdated": "2026-10-19T08:49:16.094Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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