Memory Access Vulnerability in Linux Kernel Affecting PowerPC pSeries

CVE-2025-21713

Summary

A memory access vulnerability exists in the Linux kernel affecting PowerPC pSeries architecture, primarily due to improper handling of address window settings in the IOMMU subsystem. When multiple IOMMU groups attempt to use the same VFIO container, the kernel can fall into a NULL pointer dereference, ultimately leading to system crashes and potential denial-of-service. The flaw has been addressed through improved null checking mechanisms before unsetting windows.

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