CVE-2025-29940

AMD SEV Firmware Unverified Ownership Check Enables Guest Memory Overwrite

Published Nov 10, 2026 CVSS 4.0 · 5.9 Medium EPSS < 1% KEV · Not listed
Description
Unverified ownership in Secure Encrypted Virtualization (SEV) firmware could allow a privileged attacker with access to a malicious hypervisor to overwrite guest memory if segmented Reverse Map Table (RMP) is enabled potentially resulting in loss of guest data integrity.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title AMD SEV Firmware Unverified Ownership Check Enables Guest Memory Overwrite
Type Values Removed Values Added
First Time appeared Amd
Amd epyc 9005 Series Processors
Amd epyc Embedded 9005 Series Processors
Vendors & Products Amd
Amd epyc 9005 Series Processors
Amd epyc Embedded 9005 Series Processors
Type Values Removed Values Added
Title SEV Firmware Vulnerability Enables Guest Memory Overwrite via Unverified Ownership
Type Values Removed Values Added
Title SEV Firmware Vulnerability Enables Guest Memory Overwrite via Unverified Ownership
Type Values Removed Values Added
Description Unverified ownership in Secure Encrypted Virtualization (SEV) firmware could allow a privileged attacker with access to a malicious hypervisor to overwrite guest memory if segmented Reverse Map Table (RMP) is enabled potentially resulting in loss of guest data integrity.
Weaknesses CWE-283
References
Metrics cvssV4_0

{'score': 5.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMD
Published
Updated
Nov 12, 2026, 11:45 PM
Reserved
Mar 12, 2025, 3:14 PM
Status
Awaiting Analysis
Published
Nov 10, 2026, 10:17 PM
Modified
Nov 13, 2026, 12:20 AM