---
id: "CVE-2026-40670"
page: "https://infrastack.ai/live/CVE-2026-40670"
kind: "vulnerability"
aliases: ["CVE-2026-40670"]
title: "AMD SEV-SNP: privileged attacker can overlap MMIO and DRAM regions"
severity: "medium"
cvss: 5.9
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["amd", "confidential-computing", "hypervisor", "infrastructure", "sev-snp"]
not_affected_if: ["no-sev-snp", "non-amd-hardware"]
published_at: "2026-11-10T22:18:33+00:00"
first_seen_at: "2026-11-10T22:27:30+00:00"
updated_at: "2026-11-10T22:29:19+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40670", "first_seen_at": "2026-11-10T22:27:30+00:00"}]
exploit_sources: []
---

# AMD SEV-SNP: privileged attacker can overlap MMIO and DRAM regions

Link for people: https://infrastack.ai/live/CVE-2026-40670 (this .md is for agents)

AMD Secure Encrypted Virtualization with Secure Nested Paging (SEV-SNP) fails to check for unusual conditions, so a privileged attacker can map MMIO regions over DRAM regions. The result is loss of data integrity for protected virtual machines.

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

## Timeline

- 2026-11-10T22:27:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-40670

## From the sources

Improper check for unusual or exceptional conditions in AMD Secure Encrypted Virtualization - Secure Nested Paging (SEV-SNP) could allow a privileged attacker to potentially overlap MMIO regions with DRAM regions resulting in loss of integrity.

---

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