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AMD issues patches for RMPocalypse flaw in SEV-SNP

⚠️ AMD released mitigations and firmware/BIOS updates to address a vulnerability dubbed RMPocalypse, which ETH Zürich researchers Benedict Schlüter and Shweta Shinde say can be triggered by a single 8-byte overwrite of the Reverse Map Paging (RMP) table during SEV‑SNP initialization. The flaw, assigned CVE-2025-0033, stems from a race condition in the AMD Secure Processor/Platform Security Processor (PSP/ASP) that could allow an admin-privileged or malicious hypervisor to modify initial RMP content and void SEV‑SNP integrity guarantees. AMD listed impacted EPYC families and provided vendor guidance; Microsoft and Supermicro have acknowledged the issue and are working on remediations.