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CVE-2026-80554

9.3 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is do…

Published Aug 26, 2026EPSS 0.20%

Overview

CVE-2026-80554 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: Limit the number of channel program segments

The processing of channel programs, and the CCWs within them, is done

recursively. As such, there is an arbitrary (but not architectural)

limit to the number of CCWs that can exist in a single channel program.

The vfio-ccw logic breaks these channel programs into segments whenever

it encounters a Transfer-In-Channel (TIC) CCW, and the combined number

of segments count towards the global limit. Impose an equivalent limit

to the number of segments until such logic can be made non-recursive.

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/06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2Refgit.kernel.org/stable/c/15fb4559a7fdf0b8725e433a71cfd03a1313a48bRefgit.kernel.org/stable/c/4ee94790490ae8dcc97df8597f07836c8a81bbcfRefgit.kernel.org/stable/c/5405c90d6a47b3014e74ee0618a162449abbbc93Refgit.kernel.org/stable/c/a1625f66eaa1200068a0e2c05bc90e65182fc4e3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80554?

CVE-2026-80554 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-2026-80554?

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-2026-80554?

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-2026-80554?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80554 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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