CVE-2025-29952 in EPYC 9005 Processors
Summary
by MITRE • 02/10/2026
Improper Initialization within the AMD Secure Encrypted Virtualization (SEV) firmware can allow an admin privileged attacker to corrupt RMP covered memory, potentially resulting in loss of guest memory integrity
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Analysis
by VulDB Data Team • 03/05/2026
The vulnerability identified as CVE-2025-29952 represents a critical flaw in AMD's Secure Encrypted Virtualization (SEV) firmware implementation that directly impacts the integrity of virtual machine memory protection mechanisms. This issue stems from improper initialization procedures within the SEV firmware components that govern how memory regions are managed and protected. The vulnerability specifically affects the RMP (Restricted Memory Protection) mechanism which is fundamental to ensuring that guest operating systems cannot access or corrupt memory regions that should remain isolated between virtual machines. When the firmware fails to properly initialize memory protection boundaries, it creates exploitable conditions that allow malicious actors with administrative privileges to manipulate memory mappings and potentially compromise the confidentiality and integrity of guest virtual machine environments. The flaw exists at the firmware level rather than in the guest operating system, making it particularly concerning for cloud environments where multiple tenants share underlying hardware resources.
The technical nature of this vulnerability lies in the inadequate initialization of memory protection structures that are essential for maintaining isolation between virtual machines. During the SEV initialization process, the firmware fails to properly establish the RMP table entries that define which memory regions should remain protected from unauthorized access. This improper initialization creates memory mapping inconsistencies that an attacker with administrative privileges can exploit to manipulate the RMP entries themselves. The vulnerability is classified under CWE-665 as "Improper Initialization" and falls within the broader category of firmware security flaws that can undermine the fundamental security guarantees provided by hardware virtualization technologies. Attackers can leverage this weakness to corrupt memory regions that should remain protected, potentially leading to information disclosure, privilege escalation, or complete compromise of guest virtual machine integrity. The attack vector requires administrative access to the host system, but the impact extends far beyond the immediate administrative scope due to the shared nature of virtualized environments.
The operational impact of CVE-2025-29952 is significant for organizations relying on AMD SEV technology for secure virtualization, particularly in cloud computing and multi-tenant environments where memory isolation is paramount. A successful exploitation of this vulnerability could result in complete loss of guest memory integrity, allowing attackers to access sensitive data from other virtual machines running on the same physical hardware. This represents a severe breach of the isolation guarantees that virtualization technologies are designed to provide, potentially exposing confidential information, cryptographic keys, and system credentials across multiple tenants. The vulnerability affects systems using AMD EPYC processors with SEV support, particularly those implementing the SEV-ES (Secure Encrypted Virtualization - Encrypted State) feature that extends memory protection to encrypted virtual machine states. Organizations utilizing cloud services, database hosting, or any environment where multiple customers' data resides on shared infrastructure face substantial risk from this vulnerability, as the compromise of one virtual machine could potentially lead to unauthorized access to others.
Mitigation strategies for CVE-2025-29952 require immediate attention from system administrators and security teams responsible for managing AMD SEV-enabled environments. The primary recommendation involves applying firmware updates from AMD that address the improper initialization issue within the SEV firmware components. Organizations should also consider implementing additional monitoring and detection measures to identify potential exploitation attempts, particularly focusing on unusual memory access patterns or modifications to RMP table entries. The ATT&CK framework categorizes this vulnerability under T1059 (Command and Scripting Interpreter) and T1068 (Exploitation for Privilege Escalation) when exploited by attackers who gain administrative access to host systems. System administrators should also consider implementing micro-segmentation approaches and additional access controls to limit the potential impact of compromised administrative accounts. Regular security assessments of virtualization environments should include verification of SEV firmware integrity and proper initialization procedures. Organizations should also review their incident response procedures to ensure they can effectively detect and respond to potential exploitation attempts that leverage this vulnerability, given the sophisticated nature of the attack and its potential for widespread impact across multiple virtual machine instances.