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CVE-2026-43336

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: lib/crypto: chacha: Zeroize permuted_state before it leaves scope Since the ChaCha permutation is invertible, the local variabl…

Published May 8, 2026EPSS 0.43%

Overview

CVE-2026-43336 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

lib/crypto: chacha: Zeroize permuted_state before it leaves scope

Since the ChaCha permutation is invertible, the local variable

'permuted_state' is sufficient to compute the original 'state', and thus

the key, even after the permutation has been done.

While the kernel is quite inconsistent about zeroizing secrets on the

stack (and some prominent userspace crypto libraries don't bother at all

since it's not guaranteed to work anyway), the kernel does try to do it

as a best practice, especially in cases involving the RNG.

Thus, explicitly zeroize 'permuted_state' before it goes out of scope.

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/066c760acead1fb743bae294dbd89f479ae43b9bRefgit.kernel.org/stable/c/1933249263c3a98df79992f61a566476e4163bccRefgit.kernel.org/stable/c/1d761e5a7340c46479fb2399598f331e4fe2c633Refgit.kernel.org/stable/c/91999af43ca2125e3b2c18fcfc02912ada02efc3Refgit.kernel.org/stable/c/b416a4245f04a450c67a13e6d96056c37c5b33feRefgit.kernel.org/stable/c/bd62d9b44464a6c20a34a74068e7a784d0afa04aRefgit.kernel.org/stable/c/e5046823f8fa3677341b541a25af2fcb99a5b1e0Refgit.kernel.org/stable/c/e90ee961af515a484f091678ce58a4c3f7b73b02

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43336?

CVE-2026-43336 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-43336?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-43336?

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-2026-43336?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43336 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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