CVE-2025-0033 AMD CVE-2025-0033: RMP Corruption During SNP Initialization

This post has been republished via RSS; it originally appeared at: MSRC Security Update Guide.

Microsoft is aware of [AMD-SB-3020 | CVE-2025-0033](http://https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3020.html) disclosed by AMD on October 13, 2025. CVE-2025-0033 is a vulnerability in AMD EPYC processors using Secure Encrypted Virtualization – Secure Nested Paging (SEV-SNP). It involves a race condition during Reverse Map Table (RMP) initialization that could allow a malicious or compromised hypervisor to modify RMP entries before they are locked, potentially impacting the integrity of SEV-SNP guest memory. This issue does not expose plaintext data or secrets and requires privileged control of the hypervisor to exploit. Across Azure Confidential Computing products, multiple security guardrails are in place to prevent host compromise, combining isolation, integrity verification and continuous monitoring. All host operations follow audited and approved management pathways, with administrative access strictly controlled, limited and logged. Together, these protections reduce the risk of host compromise or unauthorized memory manipulation, helping ensure that confidential workloads and customer VMs maintain their confidentiality and integrity on Azure hosts.