Improper handling of invalid nested page table entries in the IOMMU may allow a privileged attacker to induce page table entry (PTE) faults to bypass RMP checks in SEV-SNP, potentially leading to a loss of guest memory integrity.
https://www.amd.com/en/resources/product-security/bulletin/amd-sb-5004.html
https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3009.html