CVE-2025-40155

The CVE-2025-40155 issue is in the Linux kernel iommu/vt-d: debugfs legacy mode page table dump logic. In legacy mode, SSPTPTR may be ignored when TT is not 00b or 01b, leaving SSPTPTR uninitialized/zero and risking an OOPs like a general protection fault. The publicly provided fixes add a guard ...