CVE-2026-80551 (CVSS 9.3)

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.

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CVSS v3.1 Score

9.3

CRITICAL

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0014

Probability of exploitation

0.04%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/08ef2a82115690d6e229615872ac1731af732497 https://git.kernel.org/stable/c/0d46c2565f173bcddcdcaf44a4f69789a20535e2 https://git.kernel.org/stable/c/460b977a4e71cc319fdadf91c193ec3beaa57263 https://git.kernel.org/stable/c/565bef268d75bf7df665bce6923a88cd0eb74592 https://git.kernel.org/stable/c/fc59e9482117ebdccd6dc7fa8082f8b980fd021e

Frequently Asked Questions

What is CVE-2026-80551? +

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. It has a CVSS v3.1 base score of 9.3 (CRITICAL).

How severe is CVE-2026-80551? +

CVE-2026-80551 has a CVSS v3.1 score of 9.3 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0014, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-80551? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-80551