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.

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

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References
Link Providers
https://git.kernel.org/stable/c/01bb4045d2306c266178f49ce0c3576d237a3040 cve-icon cve-icon
https://git.kernel.org/stable/c/425a22c5373d4e1b46492ab869074ebeeade61f3 cve-icon cve-icon
https://git.kernel.org/stable/c/7ab69426e7ecbd18a222ee2ec87ca612d30197d7 cve-icon cve-icon
https://git.kernel.org/stable/c/91649c02c1baaa18cedf7fb425fa1f0f852c8183 cve-icon cve-icon
https://git.kernel.org/stable/c/c8ff0ca6508535bccabd81c5c9dcc63de8a3d4fb cve-icon cve-icon
https://git.kernel.org/stable/c/d05111bfe37bfd8bd4d2dfe6675d6bdeef43f7c7 cve-icon cve-icon
https://git.kernel.org/stable/c/ec17efb1ef91506cfd17a77692eaf4bbacb520ea cve-icon cve-icon
https://git.kernel.org/stable/c/fa14e0e19820b1bbdb42185c9c4efa950bcffef9 cve-icon cve-icon
History

Fri, 08 May 2026 19:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287
CWE-296

Fri, 08 May 2026 14:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Bluetooth: SMP: force responder MITM requirements before building the pairing response
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-05-08T13:31:20.923Z

Reserved: 2026-05-01T14:12:56.002Z

Link: CVE-2026-43334

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-08T14:16:43.130

Modified: 2026-05-08T14:16:43.130

Link: CVE-2026-43334

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-08T19:30:05Z