CVE-2026-80551
CriticalCVSS 9.3Summary
In the Linux kernel, in the s390/vfio_ccw subsystem, there is a lack of verification that the first IDAW remains constant between reads. This can lead to an inconsistent set of IDAWs.
Risk Assessment
Inconsistent IDAWs can lead to errors in I/O operations, potentially causing system crashes or malfunction.
Recommendation
Apply the kernel patch that verifies the first IDAW address is unchanged between reads.
Original NVD description (English source)
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.