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CVE-2026-43057

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback NETIF_F_IPV6_CSUM only advertises support for checksum offload…

Published May 1, 2026EPSS 0.81%

Overview

CVE-2026-43057 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, 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:

net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback

NETIF_F_IPV6_CSUM only advertises support for checksum offload of

packets without IPv6 extension headers. Packets with extension

headers must fall back onto software checksumming. Since TSO

depends on checksum offload, those must revert to GSO.

The below commit introduces that fallback. It always checks

network header length. For tunneled packets, the inner header length

must be checked instead. Extend the check accordingly.

A special case is tunneled packets without inner IP protocol. Such as

RFC 6951 SCTP in UDP. Those are not standard IPv6 followed by

transport header either, so also must revert to the software GSO path.

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/2094a7cf91b71367b649f991aacc7b579f793d0bRefgit.kernel.org/stable/c/33670f780e0120c3dacda188c512bbffe0b6044cRefgit.kernel.org/stable/c/732fdeb2987c94b439d51f5cb9addddc2fc48c42Refgit.kernel.org/stable/c/a98b78116a27e2a57b696b569b2cb431c95cf9b6Refgit.kernel.org/stable/c/c4336a07eb6b2526dc2b62928b5104b41a7f81f5Refgit.kernel.org/stable/c/ed71cf465c75f5688b07a35d373cd1d6b589c8eaRefcert-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-2026-43057?

CVE-2026-43057 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-43057?

This vulnerability has a CVSS 3.1 base score of 7.5, 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-2026-43057?

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-2026-43057?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43057 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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