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CVE-2026-43306

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: bpf: crypto: Use the correct destructor kfunc type With CONFIG_CFI enabled, the kernel strictly enforces that indirect function…

Published May 8, 2026EPSS 0.16%

Overview

CVE-2026-43306 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

bpf: crypto: Use the correct destructor kfunc type

With CONFIG_CFI enabled, the kernel strictly enforces that indirect

function calls use a function pointer type that matches the target

function. I ran into the following type mismatch when running BPF

self-tests:

CFI failure at bpf_obj_free_fields+0x190/0x238 (target:

bpf_crypto_ctx_release+0x0/0x94; expected type: 0xa488ebfc)

Internal error: Oops - CFI: 00000000f2008228 [#1] SMP

...

As bpf_crypto_ctx_release() is also used in BPF programs and using

a void pointer as the argument would make the verifier unhappy, add

a simple stub function with the correct type and register it as the

destructor kfunc instead.

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/3979a550fe06b370d73647f59cf462fa525c9ec4Refgit.kernel.org/stable/c/4e3e57dbf46dad3498f8c4219ce2dba756875962Refgit.kernel.org/stable/c/50d6fd69388cc7b05dce72f09080674dcede4ac9Refgit.kernel.org/stable/c/b40a5d724f29fc2eed23ff353808a9aae616b48a

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43306?

CVE-2026-43306 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43306?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43306?

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-2026-43306?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43306 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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