---
id: "CVE-2026-28249"
page: "https://infrastack.ai/live/CVE-2026-28249"
kind: "vulnerability"
aliases: ["CVE-2026-28249"]
title: "AMD SEV firmware: hypervisor can corrupt guest memory cache coherency"
severity: "medium"
cvss: 4.6
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["amd", "confidential-computing", "hypervisor", "infrastructure", "kvm", "linux", "sev"]
not_affected_if: ["no-sev-guests", "non-amd-hardware"]
published_at: "2026-11-10T22:18:32+00:00"
first_seen_at: "2026-11-10T22:27:30+00:00"
updated_at: "2026-11-10T22:30:59+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28249", "first_seen_at": "2026-11-10T22:27:30+00:00"}]
exploit_sources: []
---

# AMD SEV firmware: hypervisor can corrupt guest memory cache coherency

Link for people: https://infrastack.ai/live/CVE-2026-28249 (this .md is for agents)

AMD Secure Encrypted Virtualization (SEV) firmware fails to keep independent copies of shared state consistent. A malicious hypervisor could affect cache coherency for guest context pages, causing loss of data integrity inside 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-2026-28249

## From the sources

Improper preservation of consistency between independent representations of shared state in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to potentially affect cache coherency for guest context pages 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_