CVE-2026-53255 (GCVE-0-2026-53255)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
Title
Bluetooth: MGMT: validate advertising TLV before type checks
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: validate advertising TLV before type checks tlv_data_is_valid() reads each advertising data field length from data[i], then inspects data[i + 1] for managed EIR types before checking that the current field still fits inside the supplied buffer. A malformed field whose length byte is the last byte of the buffer can therefore make the parser read one byte past the advertising data. KASAN reported the following when a malformed MGMT_OP_ADD_ADVERTISING request reached that path: BUG: KASAN: vmalloc-out-of-bounds in tlv_data_is_valid() Read of size 1 Call trace: tlv_data_is_valid() add_advertising() hci_mgmt_cmd() hci_sock_sendmsg() Move the existing element-length check before any type-octet inspection so each non-empty element is proven to contain its type byte before the parser looks at data[i + 1].
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2bb36870e8cb29949ef9acec37129cd8e70f1857 , < 13ad995071a06570668dd8daab3616c247c72080 (git)
Affected: 2bb36870e8cb29949ef9acec37129cd8e70f1857 , < 06fcbd79c3c360a50f9be9d370769bbd738d0976 (git)
Affected: 2bb36870e8cb29949ef9acec37129cd8e70f1857 , < f7093ac233c1e7f51d125534f46067772a113175 (git)
Affected: 2bb36870e8cb29949ef9acec37129cd8e70f1857 , < 74c08e4db35a476c3462aeb65846f955be732626 (git)
Affected: 2bb36870e8cb29949ef9acec37129cd8e70f1857 , < 18fea1cb0c2599752e908c8217490f73ddd33e00 (git)
Affected: 2bb36870e8cb29949ef9acec37129cd8e70f1857 , < 1a3c8ffbb469859b076445af44bdfa6a711d483e (git)
Affected: 2bb36870e8cb29949ef9acec37129cd8e70f1857 , < 2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57 (git)
Affected: 2bb36870e8cb29949ef9acec37129cd8e70f1857 , < de23fb62259aa01d294f77238ae3b835eb674413 (git)
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Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: validate advertising TLV before type checks\n\ntlv_data_is_valid() reads each advertising data field length from\ndata[i], then inspects data[i + 1] for managed EIR types before\nchecking that the current field still fits inside the supplied buffer.\n\nA malformed field whose length byte is the last byte of the buffer can\ntherefore make the parser read one byte past the advertising data.\n\nKASAN reported the following when a malformed MGMT_OP_ADD_ADVERTISING\nrequest reached that path:\n\n  BUG: KASAN: vmalloc-out-of-bounds in tlv_data_is_valid()\n  Read of size 1\n  Call trace:\n    tlv_data_is_valid()\n    add_advertising()\n    hci_mgmt_cmd()\n    hci_sock_sendmsg()\n\nMove the existing element-length check before any type-octet inspection\nso each non-empty element is proven to contain its type byte before the\nparser looks at data[i + 1]."
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:45.934Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/13ad995071a06570668dd8daab3616c247c72080"
        },
        {
          "url": "https://git.kernel.org/stable/c/06fcbd79c3c360a50f9be9d370769bbd738d0976"
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          "url": "https://git.kernel.org/stable/c/de23fb62259aa01d294f77238ae3b835eb674413"
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      "title": "Bluetooth: MGMT: validate advertising TLV before type checks",
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    "cveId": "CVE-2026-53255",
    "datePublished": "2026-06-25T08:39:45.934Z",
    "dateReserved": "2026-06-09T07:44:35.394Z",
    "dateUpdated": "2026-06-25T08:39:45.934Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-07-01",
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tlv_data_is_valid()\\n    add_advertising()\\n    hci_mgmt_cmd()\\n    hci_sock_sendmsg()\\n\\nMove the existing element-length check before any type-octet inspection\\nso each non-empty element is proven to contain its type byte before the\\nparser looks at data[i + 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  }
}


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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.

Sightings

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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.