CVE-2025-68760 iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show

In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Fix potential out-of-bounds read in iommummioshow In iommummiowrite, it validates the user-provided offset with the check: iommu-dbgmmiooffset iommu-mmiophysend - 4. This assumes a 4-byte access. However, the...

CVE-2025-68760

The CVE-2025-68760 entry concerns a Linux kernel vulnerability in the AMD IOMMU where iommu_mmio_write() validates the user offset against mmio_phys_end - 4 (assuming 4-byte access), but iommu_mmio_show() performs an 8-byte read (readq). If the offset equals mmio_phys_end - 4, this allows a 4-byt...