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CVE-2026-43333

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: bpf: reject direct access to nullable PTR_TO_BUF pointers check_mem_access() matches PTR_TO_BUF via base_type() which strips PT…

Published May 8, 2026CWE-476EPSS 0.16%

Overview

CVE-2026-43333 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: reject direct access to nullable PTR_TO_BUF pointers

check_mem_access() matches PTR_TO_BUF via base_type() which strips

PTR_MAYBE_NULL, allowing direct dereference without a null check.

Map iterator ctx->key and ctx->value are PTR_TO_BUF | PTR_MAYBE_NULL.

On stop callbacks these are NULL, causing a kernel NULL dereference.

Add a type_may_be_null() guard to the PTR_TO_BUF branch, matching the

existing PTR_TO_BTF_ID pattern.

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/10bc4a4dcded509c5d5c67d497900c3922c604cdRefgit.kernel.org/stable/c/21a10c06ffae24cb01fd174a7ab7736001d2ea56Refgit.kernel.org/stable/c/4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09Refgit.kernel.org/stable/c/63276547debc4d8a73eefb2c5273b2a905c961b0Refgit.kernel.org/stable/c/70abd9d118da2f56beb4ec22e3a29becae373535Refgit.kernel.org/stable/c/8755066f7bd0f4ac46a29d1708c7b20894539252Refgit.kernel.org/stable/c/b0db1accbc7395657c2b79db59fa9fae0d6656f3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43333?

CVE-2026-43333 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-2026-43333?

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-2026-43333?

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-2026-43333?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43333 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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