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CVE-2026-43093

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: xsk: tighten UMEM headroom validation to account for tailroom and min frame The current headroom validation in xdp_umem_reg() c…

Published May 6, 2026EPSS 0.14%

Overview

CVE-2026-43093 is a high-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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:

xsk: tighten UMEM headroom validation to account for tailroom and min frame

The current headroom validation in xdp_umem_reg() could leave us with

insufficient space dedicated to even receive minimum-sized ethernet

frame. Furthermore if multi-buffer would come to play then

skb_shared_info stored at the end of XSK frame would be corrupted.

HW typically works with 128-aligned sizes so let us provide this value

as bare minimum.

Multi-buffer setting is known later in the configuration process so

besides accounting for 128 bytes, let us also take care of tailroom space

upfront.

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/0ec4d3f6e6934deb843b561ae048cd17218e5ad1Refgit.kernel.org/stable/c/1a6051cd7e3e4c54ff3854a43b638b9292af5e67Refgit.kernel.org/stable/c/5f123bc278bf4e3283d8606321bebbfd299f4384Refgit.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39Refgit.kernel.org/stable/c/8769708add9eadeea8041a9761771bb715a87104Refgit.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12Refgit.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414fRefgit.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43093?

CVE-2026-43093 is a high-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-43093?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2026-43093?

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-2026-43093?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43093 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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