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CVE-2026-43025

7.3 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: ignore explicit helper on new expectations Use the existing master conntrack helper, anything else is not…

Published May 1, 2026CWE-125EPSS 0.17%

Overview

CVE-2026-43025 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, 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:

netfilter: ctnetlink: ignore explicit helper on new expectations

Use the existing master conntrack helper, anything else is not really

supported and it just makes validation more complicated, so just ignore

what helper userspace suggests for this expectation.

This was uncovered when validating CTA_EXPECT_CLASS via different helper

provided by userspace than the existing master conntrack helper:

BUG: KASAN: slab-out-of-bounds in nf_ct_expect_related_report+0x2479/0x27c0

Read of size 4 at addr ffff8880043fe408 by task poc/102

Call Trace:

nf_ct_expect_related_report+0x2479/0x27c0

ctnetlink_create_expect+0x22b/0x3b0

ctnetlink_new_expect+0x4bd/0x5c0

nfnetlink_rcv_msg+0x67a/0x950

netlink_rcv_skb+0x120/0x350

Allowing to read kernel memory bytes off the expectation boundary.

CTA_EXPECT_HELP_NAME is still used to offer the helper name to userspace

via netlink dump.

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/0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cdRefgit.kernel.org/stable/c/187b6ec5229ea93cb04c4f6d3b52efc80f513d0dRefgit.kernel.org/stable/c/21a04c31db4057deec85fcd6cc63d720b38819c3Refgit.kernel.org/stable/c/2ea0f35f235f70c133ad61fe05ba013753b978c6Refgit.kernel.org/stable/c/917b61fa2042f11e2af4c428e43f08199586633aRefgit.kernel.org/stable/c/e135f8e8212cbed12a03ab8dec77fa1247139897Refcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43025?

CVE-2026-43025 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-43025?

This vulnerability has a CVSS 3.1 base score of 7.3, 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-2026-43025?

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-2026-43025?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43025 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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