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CVE-2026-80586

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: mptcp: options: reset DSS fields in case of unexpected size A remote peer could send a malformed DSS with a wrong size, followe…

Published Aug 26, 2026EPSS 0.40%

Overview

CVE-2026-80586 is a critical-severity vulnerability. It was published on August 26, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. 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:

mptcp: options: reset DSS fields in case of unexpected size

A remote peer could send a malformed DSS with a wrong size, followed by

another DSS or MPC + Data. In this case, the first suboption will be

ignored, but leaving some fields written, which could lead to

inconsistency or access uninitialized data.

Explicitly reset the fields that could have been modified in case of

unexpected size.

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/15e35fdad7a5576bf3f1c8d688877aeb5d1b506bRefgit.kernel.org/stable/c/192878df582c51d440bf7b91a15f297f29f2b596Refgit.kernel.org/stable/c/1fade1b2ac5b1a4948e538fae7313bea57b5ac36Refgit.kernel.org/stable/c/26dac5c9ffb20812b475fdf253eb04fab99cff3bRefgit.kernel.org/stable/c/27ed642a4e7e4b5df4b8522c72c457a67e052493Refgit.kernel.org/stable/c/35772b4981f38ba8059372cde8753e8e477e98ecRefgit.kernel.org/stable/c/4e80eff5c1c893aca2ac1d202f0b256d2e52ecdeRefgit.kernel.org/stable/c/b1256090816ec46011601e084be580731df58fc7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80586?

CVE-2026-80586 is a critical-severity vulnerability. It was published on August 26, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-80586?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-80586?

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-2026-80586?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80586 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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