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Bluetooth: MGMT: validate advertising TLV before type checks

Type: advisorySource: Official CVE List1 source record

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].

Announced Source revision 1
Original source ↗

CVE-2026-53255

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-2026-53255

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": "2bb36870e8cb29949ef9acec37129cd8e70f1857",
        "lessThan": "13ad995071a06570668dd8daab3616c247c72080",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2bb36870e8cb29949ef9acec37129cd8e70f1857",
        "lessThan": "06fcbd79c3c360a50f9be9d370769bbd738d0976",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2bb36870e8cb29949ef9acec37129cd8e70f1857",
        "lessThan": "f7093ac233c1e7f51d125534f46067772a113175",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2bb36870e8cb29949ef9acec37129cd8e70f1857",
        "lessThan": "74c08e4db35a476c3462aeb65846f955be732626",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2bb36870e8cb29949ef9acec37129cd8e70f1857",
        "lessThan": "18fea1cb0c2599752e908c8217490f73ddd33e00",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2bb36870e8cb29949ef9acec37129cd8e70f1857",
        "lessThan": "1a3c8ffbb469859b076445af44bdfa6a711d483e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2bb36870e8cb29949ef9acec37129cd8e70f1857",
        "lessThan": "2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2bb36870e8cb29949ef9acec37129cd8e70f1857",
        "lessThan": "de23fb62259aa01d294f77238ae3b835eb674413",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bluetooth/mgmt.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/mgmt.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53255

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28444 · Revision 1
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