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CVE-2026-43092

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: xsk: validate MTU against usable frame size on bind AF_XDP bind currently accepts zero-copy pool configurations without verifyi…

Published May 6, 2026EPSS 0.16%

Overview

CVE-2026-43092 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:

xsk: validate MTU against usable frame size on bind

AF_XDP bind currently accepts zero-copy pool configurations without

verifying that the device MTU fits into the usable frame space provided

by the UMEM chunk.

This becomes a problem since we started to respect tailroom which is

subtracted from chunk_size (among with headroom). 2k chunk size might

not provide enough space for standard 1500 MTU, so let us catch such

settings at bind time. Furthermore, validate whether underlying HW will

be able to satisfy configured MTU wrt XSK's frame size multiplied by

supported Rx buffer chain length (that is exposed via

net_device::xdp_zc_max_segs).

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/25e1e91a8da819924df0b16e3812d7b24c8ce133Refgit.kernel.org/stable/c/36ee60b569ba0dfb6f961333b90d19ab5b323fa9Refgit.kernel.org/stable/c/a55793e5a97d4e39bdb380873a9780fe0010bff6Refgit.kernel.org/stable/c/b2f4daa6422fd6cc0cec969794dab4a88ea4cea1Refgit.kernel.org/stable/c/f669d60db11dbabb96279f2b20f9d1cba43cddb2

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43092?

CVE-2026-43092 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-2026-43092?

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-2026-43092?

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-2026-43092?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43092 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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