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CVE-2026-43334

8.8 · HIGH

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 t…

Published May 8, 2026EPSS 0.25%

Overview

CVE-2026-43334 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/01bb4045d2306c266178f49ce0c3576d237a3040Refgit.kernel.org/stable/c/425a22c5373d4e1b46492ab869074ebeeade61f3Refgit.kernel.org/stable/c/7ab69426e7ecbd18a222ee2ec87ca612d30197d7Refgit.kernel.org/stable/c/91649c02c1baaa18cedf7fb425fa1f0f852c8183Refgit.kernel.org/stable/c/c8ff0ca6508535bccabd81c5c9dcc63de8a3d4fbRefgit.kernel.org/stable/c/d05111bfe37bfd8bd4d2dfe6675d6bdeef43f7c7Refgit.kernel.org/stable/c/ec17efb1ef91506cfd17a77692eaf4bbacb520eaRefgit.kernel.org/stable/c/fa14e0e19820b1bbdb42185c9c4efa950bcffef9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43334?

CVE-2026-43334 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-43334?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-43334?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43334?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43334 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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