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CVE-2026-43020

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: validate LTK enc_size on load Load Long Term Keys stores the user-provided enc_size and later uses it to size…

Published May 1, 2026CWE-787EPSS 0.13%

Overview

CVE-2026-43020 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: MGMT: validate LTK enc_size on load

Load Long Term Keys stores the user-provided enc_size and later uses

it to size fixed-size stack operations when replying to LE LTK

requests. An enc_size larger than the 16-byte key buffer can therefore

overflow the reply stack buffer.

Reject oversized enc_size values while validating the management LTK

record so invalid keys never reach the stored key state.

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/0f37d1e65c6d71ad94ccfb5c602163c525db789dRefgit.kernel.org/stable/c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64Refgit.kernel.org/stable/c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009Refgit.kernel.org/stable/c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257Refgit.kernel.org/stable/c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6Refgit.kernel.org/stable/c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15Refgit.kernel.org/stable/c/c34577f517b556fb6ca173d45bf7e766ae2564ceRefgit.kernel.org/stable/c/f71695e81f4cb428f3c7e2138eae88199005b52c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43020?

CVE-2026-43020 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-43020?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43020?

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-2026-43020?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43020 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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