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CVE-2026-43190

8.2 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_tcpmss: check remaining length before reading optlen Quoting reporter: In net/netfilter/xt_tcpmss.c (lines 53-6…

Published May 6, 2026CWE-125EPSS 0.46%

Overview

CVE-2026-43190 is a high-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, 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:

netfilter: xt_tcpmss: check remaining length before reading optlen

Quoting reporter:

In net/netfilter/xt_tcpmss.c (lines 53-68), the TCP option parser reads

op[i+1] directly without validating the remaining option length.

If the last byte of the option field is not EOL/NOP (0/1), the code attempts

to index op[i+1]. In the case where i + 1 == optlen, this causes an

out-of-bounds read, accessing memory past the optlen boundary

(either reading beyond the stack buffer _opt or the

following payload).

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/07a9b32eaae792ff7d0fcac14d8920c937c0a9c3Refgit.kernel.org/stable/c/5e13d0a37666955b6cfddc0f73cb40ed645b8a05Refgit.kernel.org/stable/c/735ee8582da3d239eb0c7a53adca61b79fb228b3Refgit.kernel.org/stable/c/8b300f726640c48c3edfe9c453334dd801f4b74eRefgit.kernel.org/stable/c/cd5beda7e0e32865e214f28034bb92c1cecff885Refgit.kernel.org/stable/c/eaedc0bc18be46fe7f58170e967959a932c4f824Refgit.kernel.org/stable/c/f6c412dcfd76b0516d51aa847d8f4c7b70381b09Refgit.kernel.org/stable/c/f895191dc32c53eaf443b6443fe40945b2f92287

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43190?

CVE-2026-43190 is a high-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-43190?

This vulnerability has a CVSS 3.1 base score of 8.2, 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-2026-43190?

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-2026-43190?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43190 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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