# CVE-2026-28249: AMD Secure Encrypted Virtualization cache coherency integrity issue

Source: https://junglewise.ai/threats/cve-2026-28249-improper-preservation-of-consistency-between-independent  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-28249 · Severity: info · Published 2026-11-10

AMD's Secure Encrypted Virtualization (SEV) is a security feature that encrypts virtual machine memory to protect sensitive data even from the underlying hypervisor. A flaw in the firmware's cache coherency handling could allow a malicious hypervisor to tamper with guest data integrity, potentially compromising the confidentiality guarantees that SEV provides.

Vendors: [Amd](https://junglewise.ai/threats/vendors/amd).

## Quick answers

**Is CVE-2026-28249 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-28249 being exploited in the wild.

**How severe is CVE-2026-28249?** Informational severity, published 10 November 2026.

**Which products and versions are affected?** AMD Secure Encrypted Virtualization (SEV).

**Is there a fix for CVE-2026-28249?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-28249 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-28249?** Check whether you run Amd Secure Encrypted Virtualization (SEV). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an improper preservation of consistency between independent representations of shared state in SEV firmware, affecting cache coherency for guest context pages. A malicious hypervisor with privileged access can exploit this to affect cache coherency, resulting in loss of integrity for guest data. The attack requires hypervisor-level access and no upstream fix information is currently available.

## Affected products

- AMD Secure Encrypted Virtualization (SEV)

## Timeline

- 2026-11-10: disclosed

## References

- [https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3038.html](https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3038.html)

## Related threats

- [AMD Secure Encrypted Virtualization improper access control in memory regions](https://junglewise.ai/threats/cve-2026-28247-improper-access-control-applied-to-mirrored-or-aliased-memory)