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CVE-2026-89583 (GCVE-0-2026-89583)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-09-14 12:01
VLAI
Title
Bluetooth: eir: Fix OOB read in eir_get_service_data()
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.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a , < b6902adf81ea2ce14b1040dd97b6980050a8125a (git)
Affected: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a , < 1a28aae7f1fc8c06c0d02f153541be4fc7bacb74 (git)
Affected: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a , < 815fc98c227a78cbd93d4c29f2833705b7c2bc0f (git)
Affected: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a , < c21fa79301d7d6ac0a4ec6c51e8ba10beaa08c50 (git)
Affected: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a , < bb56e97bd67614238c1c0a4084704ccadbb875b4 (git)
Affected: 8f9ae5b3ae80f168a6224529e3787f4fb27f299a , < 4beb198bc59b242404a47c21990bc84165052c8a (git)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/eir.c"
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              "version": "6.12.109",
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              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.2.4",
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            {
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
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                  "versionEndExcluding": "7.2.4",
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                  "versionEndExcluding": "7.3-rc1",
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      "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": "2026-09-14T12:01:11.801Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/b6902adf81ea2ce14b1040dd97b6980050a8125a"
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          "url": "https://git.kernel.org/stable/c/1a28aae7f1fc8c06c0d02f153541be4fc7bacb74"
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        {
          "url": "https://git.kernel.org/stable/c/815fc98c227a78cbd93d4c29f2833705b7c2bc0f"
        },
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        },
        {
          "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()",
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        "engine": "bippy-1.2.0"
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  "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": "2026-09-14T12:01:11.801Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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      "date": "2026-09-15",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/eir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8f9ae5b3ae80f168a6224529e3787f4fb27f299a\",\"lessThan\":\"b6902adf81ea2ce14b1040dd97b6980050a8125a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f9ae5b3ae80f168a6224529e3787f4fb27f299a\",\"lessThan\":\"1a28aae7f1fc8c06c0d02f153541be4fc7bacb74\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f9ae5b3ae80f168a6224529e3787f4fb27f299a\",\"lessThan\":\"815fc98c227a78cbd93d4c29f2833705b7c2bc0f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f9ae5b3ae80f168a6224529e3787f4fb27f299a\",\"lessThan\":\"c21fa79301d7d6ac0a4ec6c51e8ba10beaa08c50\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f9ae5b3ae80f168a6224529e3787f4fb27f299a\",\"lessThan\":\"bb56e97bd67614238c1c0a4084704ccadbb875b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f9ae5b3ae80f168a6224529e3787f4fb27f299a\",\"lessThan\":\"4beb198bc59b242404a47c21990bc84165052c8a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/eir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1a28aae7f1fc8c06c0d02f153541be4fc7bacb74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4beb198bc59b242404a47c21990bc84165052c8a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/815fc98c227a78cbd93d4c29f2833705b7c2bc0f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6902adf81ea2ce14b1040dd97b6980050a8125a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb56e97bd67614238c1c0a4084704ccadbb875b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c21fa79301d7d6ac0a4ec6c51e8ba10beaa08c50\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T18:38:27+00:00",
      "cve": "CVE-2026-89583",
      "id": "CVE-2026-89583",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "185",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: eir: Fix OOB read in eir_get_service_data()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89583.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:01:53Z",
      "cve": "CVE-2026-89583",
      "id": "CVE-2026-89583",
      "initial_release_date": "2026-09-12T16:25:38Z",
      "product_status:known_affected": "84",
      "product_status:known_not_affected": "269",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89583",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89583.json",
      "version": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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