ibm power virtualization

IBM Power Virtualization, often discussed in the context of Linux on Power systems, involves the Virtual I/O (VIO) server architecture. A recent security vulnerability, CVE-2026-31464, highlights risks in the ibmvfc SCSI driver used in virtualized environments. The issue arises when a compromised VIO server sends an oversized num_written value, causing an out-of-bounds read that can leak kernel memory. The fix involves clamping the target count to prevent the leak. This topic is relevant for administrators managing IBM Power systems with virtualization, emphasizing the need for careful bounds checking in storage and virtualization paths to maintain security.