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Bluetooth: eir: Fix OOB read in eir_get_service_data()

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-89583

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89583

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "net/bluetooth/eir.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/eir.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89583

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35090 · Revision 1
Added to Heist Feed
Publisher date
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