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CVE-2026-80551: s390/vfio_ccw: Ensure first IDAW remains constant

• Severity: critical (CVSS 9.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-26 · updated 2026-10-30

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.

Affected products

• Linux: 5.3 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux 7.2. Check the vendor advisory for mitigations.

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/5b7c23440343e336259cd45017cc901a744c41b0
• https://git.kernel.org/stable/c/fc59e9482117ebdccd6dc7fa8082f8b980fd021e

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