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Bluetooth: SMP: force responder MITM requirements before building the pairing response

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SMP: force responder MITM requirements before building the pairing response smp_cmd_pairing_req() currently builds the pairing response from the initiator auth_req before enforcing the local BT_SECURITY_HIGH requirement. If the initiator omits SMP_AUTH_MITM, the response can also omit it even though the local side still requires MITM. tk_request() then sees an auth value without SMP_AUTH_MITM and may select JUST_CFM, making method selection inconsistent with the pairing policy the responder already enforces. When the local side requires HIGH security, first verify that MITM can be achieved from the IO capabilities and then force SMP_AUTH_MITM in the response in both rsp.auth_req and auth. This keeps the responder auth bits and later method selection aligned.

Announced Group revision 1
Original source ↗

CVE-2026-43334

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-2026-43334

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": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
        "lessThan": "425a22c5373d4e1b46492ab869074ebeeade61f3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
        "lessThan": "7ab69426e7ecbd18a222ee2ec87ca612d30197d7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
        "lessThan": "01bb4045d2306c266178f49ce0c3576d237a3040",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
        "lessThan": "91649c02c1baaa18cedf7fb425fa1f0f852c8183",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
        "lessThan": "c8ff0ca6508535bccabd81c5c9dcc63de8a3d4fb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
        "lessThan": "fa14e0e19820b1bbdb42185c9c4efa950bcffef9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
        "lessThan": "ec17efb1ef91506cfd17a77692eaf4bbacb520ea",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
        "lessThan": "d05111bfe37bfd8bd4d2dfe6675d6bdeef43f7c7",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bluetooth/smp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.168",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.134",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.81",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.22",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.12",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/smp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43334

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40060 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-43334 · Revision 1Source updated