by Kastro
Paper/Archive/CVE-2026-80551

CVE-2026-80551

Linux Linux — s390/vfio_ccw: Ensure first IDAW remains constant

EPSS 0.2%CVSS 9.3
critical.is priorityof 100
30
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 9.3.093 × 201.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Linux01aa26c672c0eb771de4aaa2a8ccf6055778887b – < 460b977a4e71cc319fdadf91c193ec3beaa57263460b977a4e71cc319fdadf91c193ec3beaa57263CNA
Linux01aa26c672c0eb771de4aaa2a8ccf6055778887b – < 0d46c2565f173bcddcdcaf44a4f69789a20535e20d46c2565f173bcddcdcaf44a4f69789a20535e2CNA
Linux01aa26c672c0eb771de4aaa2a8ccf6055778887b – < 08ef2a82115690d6e229615872ac1731af73249708ef2a82115690d6e229615872ac1731af732497CNA
Linux01aa26c672c0eb771de4aaa2a8ccf6055778887b – < fc59e9482117ebdccd6dc7fa8082f8b980fd021efc59e9482117ebdccd6dc7fa8082f8b980fd021eCNA
Linux01aa26c672c0eb771de4aaa2a8ccf6055778887b – < 565bef268d75bf7df665bce6923a88cd0eb74592565bef268d75bf7df665bce6923a88cd0eb74592CNA
Linux5.3–CNA

Scores by source

Linux (CNA)9.3CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgit.kernel.org/stable/c/460b977a4e71cc319fdadf91c193ec3beaa57263refgit.kernel.org/stable/c/0d46c2565f173bcddcdcaf44a4f69789a20535e2refgit.kernel.org/stable/c/08ef2a82115690d6e229615872ac1731af732497refgit.kernel.org/stable/c/fc59e9482117ebdccd6dc7fa8082f8b980fd021erefgit.kernel.org/stable/c/565bef268d75bf7df665bce6923a88cd0eb74592