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CVE-2026-80551

9.3 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Ensure first IDAW remains constant The first IDAW in a list does not need to be on a 2K/4K boundary like all oth…

Published Aug 26, 2026EPSS 0.20%

Overview

CVE-2026-80551 is a critical-severity vulnerability. It was published on August 26, 2026 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

s390/vfio_ccw: Ensure first IDAW remains constant

The first IDAW in a list does not need to be on a 2K/4K boundary

like all others, and so is read separately to accurately calculate

the size of the buffer needed to read the full IDAL.

Verify that the address found in the first IDAW is unchanged between

reads, to ensure a consistent set of IDAWs being worked with.

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/08ef2a82115690d6e229615872ac1731af732497Refgit.kernel.org/stable/c/0d46c2565f173bcddcdcaf44a4f69789a20535e2Refgit.kernel.org/stable/c/460b977a4e71cc319fdadf91c193ec3beaa57263Refgit.kernel.org/stable/c/565bef268d75bf7df665bce6923a88cd0eb74592Refgit.kernel.org/stable/c/fc59e9482117ebdccd6dc7fa8082f8b980fd021e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80551?

CVE-2026-80551 is a critical-severity vulnerability. It was published on August 26, 2026 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

How severe is CVE-2026-80551?

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-80551?

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-2026-80551?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80551 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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