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CVE-2026-80550

7.9 · HIGH

In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Fix out of bounds check on CCW array The routine ccwchain_calc_length() counts the number of channel command wor…

Published Aug 26, 2026EPSS 0.18%

Overview

CVE-2026-80550 is a high-severity vulnerability. It was published on August 26, 2026 and has a CVSS 3.1 base score of 7.9 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.9, rated HIGH. 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: Fix out of bounds check on CCW array

The routine ccwchain_calc_length() counts the number of channel

command words (CCWs) that are chained together in a single channel

program, and rejects anything larger than CCWCHAIN_LEN_MAX (256) CCWs.

The loop itself is "do..while (count < 257)", and while the logic in

is_cpa_within_range() correctly adjusts between the 0-index array of

CCWs and the count of CCWs starting at 1, this means it would look

at a possible 257th CCW before ending the loop and (correctly)

returning an error.

Fix this by restructuring the loop to break as soon as 256 CCWs

(thus indexes 0-255) are examined, without looking at memory

outside the range.

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/0282fb1c4b638eecfe2cc558092c460911d8f7e2Refgit.kernel.org/stable/c/499a8a66b1598bfab97182aed15e0f1646074a3dRefgit.kernel.org/stable/c/4c2e1d359d7a2b82cdf3254e4e480af9417f99fbRefgit.kernel.org/stable/c/907adc667d902fafbdb2d740d57b55bd025dc4cdRefgit.kernel.org/stable/c/a005b7f1a491ffda61bff0fd0f6548f8986fb977Refgit.kernel.org/stable/c/af3f80ca4c8b17f20f9e588def076288fdb49e65Refgit.kernel.org/stable/c/d5d096cd9369e986d4e5153baa86b8b35c283e09Refgit.kernel.org/stable/c/f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80550?

CVE-2026-80550 is a high-severity vulnerability. It was published on August 26, 2026 and has a CVSS 3.1 base score of 7.9 (HIGH).

How severe is CVE-2026-80550?

This vulnerability has a CVSS 3.1 base score of 7.9, rated HIGH. 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-2026-80550?

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-2026-80550?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80550 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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