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CVE-2026-43107

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: xfrm: account XFRMA_IF_ID in aevent size calculation xfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then bui…

Published May 6, 2026CWE-131EPSS 0.16%

Overview

CVE-2026-43107 is a medium-severity vulnerability. It was published on May 6, 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:

xfrm: account XFRMA_IF_ID in aevent size calculation

xfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then

build_aevent() appends attributes including XFRMA_IF_ID when x->if_id is

set.

xfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states

with if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err < 0)

in xfrm_get_ae(), turning a malformed netlink interaction into a kernel

panic.

Account XFRMA_IF_ID in the size calculation unconditionally and replace

the BUG_ON with normal error unwinding.

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/2c41283d94af943a05f7f2cc1a01f0c872f3cf43Refgit.kernel.org/stable/c/58e5735d1a5373652f405a0c16e54ac04aaab0adRefgit.kernel.org/stable/c/7081d46d32312f1a31f0e0e99c6835a394037599Refgit.kernel.org/stable/c/e62e322ea20be78e346e4b49f9a6b9f03313af4c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43107?

CVE-2026-43107 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43107?

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-2026-43107?

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-2026-43107?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43107 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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