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Bluetooth: MGMT: validate Add Extended Advertising Data length

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: validate Add Extended Advertising Data length MGMT_OP_ADD_EXT_ADV_DATA is registered as a variable-length command, with MGMT_ADD_EXT_ADV_DATA_SIZE as the fixed header size. The handler then uses cp->adv_data_len and cp->scan_rsp_len to validate and copy cp->data, but it never checks that those bytes are part of the mgmt command payload. A short command can therefore make add_ext_adv_data() pass an out-of-bounds pointer into tlv_data_is_valid(). If the bytes beyond the command buffer are addressable, they can also be copied into the advertising instance as scan response data, where the caller can read them back via MGMT_OP_GET_ADV_INSTANCE. The trigger requires CAP_NET_ADMIN in the initial user namespace; KASAN reports an 8-byte slab-out-of-bounds read. Reject commands whose length does not match the fixed header plus both advertising data lengths before parsing cp->data.

Announced Source revision 1
Original source ↗

CVE-2026-64126

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-2026-64126

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": "12410572833a283ce92fcf9679ca8a2f372097ee",
        "lessThan": "0d5104390b445e7bd664ad583837e4c04d892c9d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12410572833a283ce92fcf9679ca8a2f372097ee",
        "lessThan": "14b01b9cba04e6ce82825f68fc4c4322fa4ffa43",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12410572833a283ce92fcf9679ca8a2f372097ee",
        "lessThan": "a143ce77a5292f2c9285137433d879ce71d190a7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12410572833a283ce92fcf9679ca8a2f372097ee",
        "lessThan": "a6c75a3fad226ccbd8ef9110dee87c92c299f2ab",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12410572833a283ce92fcf9679ca8a2f372097ee",
        "lessThan": "f1febe93ef075314615f970a87681d9ab86691d1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12410572833a283ce92fcf9679ca8a2f372097ee",
        "lessThan": "0bc1a5a69f541859293d79db72bd7854ac48df51",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "12410572833a283ce92fcf9679ca8a2f372097ee",
        "lessThan": "d3f7d17960ed50df3a6709c5158caff989c8c905",
        "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": "5.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.142",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.92",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.34",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.11",
        "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-2026-64126

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40962 · Revision 1
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Publisher date
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