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Bluetooth: MGMT: validate advertising TLV before type checks

Type: advisorySources: OSV

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].

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.259, 5.15.210, 6.1.176, 6.12.94, 6.18.36, 6.6.143, 7.0.13
CVEs
CVE-2026-53255
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 08:08 UTC · Revision 1

Source evidence

Bluetooth: MGMT: validate advertising TLV before type checks

core-osv · Original source

Published 25 Jun 2026, 08:39 UTC

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].

osv:CVE-2026-53255

Kernel

Fixed versions: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13

Complete source record
{
  "id": "937ca0291a77ae4d14ce61227534a6adc750598a7347117e5a3faaa09a27f588",
  "url": "https://osv.dev/vulnerability/CVE-2026-53255",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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].",
    "evidence": "osv:CVE-2026-53255",
    "products": [
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          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "6.1.176",
            "evidence": "/affected/1/ranges"
          },
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            "value": "6.6.143",
            "evidence": "/affected/1/ranges"
          },
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          {
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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      "affected": [
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                  "introduced": "4.9.0"
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          "database_specific": {
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          }
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      ],
      "modified": "2026-10-28T02:30:27.357726463Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-784472.html",
        "https://git.kernel.org/stable/c/06fcbd79c3c360a50f9be9d370769bbd738d0976",
        "https://git.kernel.org/stable/c/13ad995071a06570668dd8daab3616c247c72080",
        "https://git.kernel.org/stable/c/18fea1cb0c2599752e908c8217490f73ddd33e00",
        "https://git.kernel.org/stable/c/1a3c8ffbb469859b076445af44bdfa6a711d483e",
        "https://git.kernel.org/stable/c/2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57",
        "https://git.kernel.org/stable/c/74c08e4db35a476c3462aeb65846f955be732626",
        "https://git.kernel.org/stable/c/de23fb62259aa01d294f77238ae3b835eb674413",
        "https://git.kernel.org/stable/c/f7093ac233c1e7f51d125534f46067772a113175",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53255.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53255",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53255.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53255",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493659,
  "published_at": "2026-06-25T08:39:45.934+00:00"
}