CVE-2026-43334 (GCVE-0-2026-43334)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:31 – Updated: 2026-05-08 13:31
VLAI?
Title
Bluetooth: SMP: force responder MITM requirements before building the pairing response
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 , < 425a22c5373d4e1b46492ab869074ebeeade61f3 (git)
Affected: 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 , < 7ab69426e7ecbd18a222ee2ec87ca612d30197d7 (git)
Affected: 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 , < 01bb4045d2306c266178f49ce0c3576d237a3040 (git)
Affected: 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 , < 91649c02c1baaa18cedf7fb425fa1f0f852c8183 (git)
Affected: 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 , < c8ff0ca6508535bccabd81c5c9dcc63de8a3d4fb (git)
Affected: 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 , < fa14e0e19820b1bbdb42185c9c4efa950bcffef9 (git)
Affected: 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 , < ec17efb1ef91506cfd17a77692eaf4bbacb520ea (git)
Affected: 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 , < d05111bfe37bfd8bd4d2dfe6675d6bdeef43f7c7 (git)
Create a notification for this product.
    Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/smp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "425a22c5373d4e1b46492ab869074ebeeade61f3",
              "status": "affected",
              "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
              "versionType": "git"
            },
            {
              "lessThan": "7ab69426e7ecbd18a222ee2ec87ca612d30197d7",
              "status": "affected",
              "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
              "versionType": "git"
            },
            {
              "lessThan": "01bb4045d2306c266178f49ce0c3576d237a3040",
              "status": "affected",
              "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
              "versionType": "git"
            },
            {
              "lessThan": "91649c02c1baaa18cedf7fb425fa1f0f852c8183",
              "status": "affected",
              "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
              "versionType": "git"
            },
            {
              "lessThan": "c8ff0ca6508535bccabd81c5c9dcc63de8a3d4fb",
              "status": "affected",
              "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
              "versionType": "git"
            },
            {
              "lessThan": "fa14e0e19820b1bbdb42185c9c4efa950bcffef9",
              "status": "affected",
              "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
              "versionType": "git"
            },
            {
              "lessThan": "ec17efb1ef91506cfd17a77692eaf4bbacb520ea",
              "status": "affected",
              "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
              "versionType": "git"
            },
            {
              "lessThan": "d05111bfe37bfd8bd4d2dfe6675d6bdeef43f7c7",
              "status": "affected",
              "version": "2b64d153a0cc9d2b60e47be013cde8490f16e0a5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/smp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.3"
            },
            {
              "lessThan": "3.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.134",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.253",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.134",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.81",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.12",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SMP: force responder MITM requirements before building the pairing response\n\nsmp_cmd_pairing_req() currently builds the pairing response from the\ninitiator auth_req before enforcing the local BT_SECURITY_HIGH\nrequirement. If the initiator omits SMP_AUTH_MITM, the response can\nalso omit it even though the local side still requires MITM.\n\ntk_request() then sees an auth value without SMP_AUTH_MITM and may\nselect JUST_CFM, making method selection inconsistent with the pairing\npolicy the responder already enforces.\n\nWhen the local side requires HIGH security, first verify that MITM can\nbe achieved from the IO capabilities and then force SMP_AUTH_MITM in the\nresponse in both rsp.auth_req and auth. This keeps the responder auth bits\nand later method selection aligned."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-08T13:31:20.923Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/425a22c5373d4e1b46492ab869074ebeeade61f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ab69426e7ecbd18a222ee2ec87ca612d30197d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/01bb4045d2306c266178f49ce0c3576d237a3040"
        },
        {
          "url": "https://git.kernel.org/stable/c/91649c02c1baaa18cedf7fb425fa1f0f852c8183"
        },
        {
          "url": "https://git.kernel.org/stable/c/c8ff0ca6508535bccabd81c5c9dcc63de8a3d4fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa14e0e19820b1bbdb42185c9c4efa950bcffef9"
        },
        {
          "url": "https://git.kernel.org/stable/c/ec17efb1ef91506cfd17a77692eaf4bbacb520ea"
        },
        {
          "url": "https://git.kernel.org/stable/c/d05111bfe37bfd8bd4d2dfe6675d6bdeef43f7c7"
        }
      ],
      "title": "Bluetooth: SMP: force responder MITM requirements before building the pairing response",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43334",
    "datePublished": "2026-05-08T13:31:20.923Z",
    "dateReserved": "2026-05-01T14:12:56.002Z",
    "dateUpdated": "2026-05-08T13:31:20.923Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43334",
      "date": "2026-05-09",
      "epss": "0.00024",
      "percentile": "0.07036"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43334\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-08T14:16:43.130\",\"lastModified\":\"2026-05-08T14:16:43.130\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: SMP: force responder MITM requirements before building the pairing response\\n\\nsmp_cmd_pairing_req() currently builds the pairing response from the\\ninitiator auth_req before enforcing the local BT_SECURITY_HIGH\\nrequirement. If the initiator omits SMP_AUTH_MITM, the response can\\nalso omit it even though the local side still requires MITM.\\n\\ntk_request() then sees an auth value without SMP_AUTH_MITM and may\\nselect JUST_CFM, making method selection inconsistent with the pairing\\npolicy the responder already enforces.\\n\\nWhen the local side requires HIGH security, first verify that MITM can\\nbe achieved from the IO capabilities and then force SMP_AUTH_MITM in the\\nresponse in both rsp.auth_req and auth. This keeps the responder auth bits\\nand later method selection aligned.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01bb4045d2306c266178f49ce0c3576d237a3040\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/425a22c5373d4e1b46492ab869074ebeeade61f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ab69426e7ecbd18a222ee2ec87ca612d30197d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91649c02c1baaa18cedf7fb425fa1f0f852c8183\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c8ff0ca6508535bccabd81c5c9dcc63de8a3d4fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d05111bfe37bfd8bd4d2dfe6675d6bdeef43f7c7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ec17efb1ef91506cfd17a77692eaf4bbacb520ea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fa14e0e19820b1bbdb42185c9c4efa950bcffef9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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

Author Source Type Date Other

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.