---
id: "CVE-2025-29940"
page: "https://infrastack.ai/live/CVE-2025-29940"
kind: "vulnerability"
aliases: ["CVE-2025-29940"]
title: "AMD SEV firmware: malicious hypervisor can overwrite guest memory"
severity: "medium"
cvss: 5.9
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["amd", "confidential-computing", "hypervisor", "infrastructure", "kvm", "sev"]
not_affected_if: ["no-sev", "segmented-rmp-disabled"]
published_at: "2026-11-10T22:17:45+00:00"
first_seen_at: "2026-11-10T22:27:22+00:00"
updated_at: "2026-11-10T22:30:38+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-29940", "first_seen_at": "2026-11-10T22:27:22+00:00"}]
exploit_sources: []
---

# AMD SEV firmware: malicious hypervisor can overwrite guest memory

Link for people: https://infrastack.ai/live/CVE-2025-29940 (this .md is for agents)

Unverified ownership in AMD Secure Encrypted Virtualization firmware lets a privileged attacker controlling a malicious hypervisor overwrite guest memory when segmented Reverse Map Table is enabled. The result is loss of guest data integrity.

_Summary, check and fix written by a model from the sources; labelled as such._

## Timeline

- 2026-11-10T22:27:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-29940

## From the sources

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.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_