# CVE-2026-28247: AMD Secure Encrypted Virtualization improper access control in memory regions

Source: https://junglewise.ai/threats/cve-2026-28247-improper-access-control-applied-to-mirrored-or-aliased-memory  
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-2026-28247 · Severity: info · Published 2026-11-10

AMD's Secure Encrypted Virtualization (SEV) firmware provides encryption protections for virtual machine memory in cloud and virtualized environments. A flaw in how the firmware controls access to mirrored or aliased memory regions could allow a malicious hypervisor operator to disable encryption on guest memory pages, compromising the confidentiality and integrity of guest data.

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

## Quick answers

**Is CVE-2026-28247 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-28247 being exploited in the wild.

**How severe is CVE-2026-28247?** Informational severity, published 10 November 2026.

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

**Is there a fix for CVE-2026-28247?** 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-2026-28247 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-28247?** 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 access control flaw in AMD SEV firmware affecting encrypted memory regions. A malicious hypervisor with direct hardware access can manipulate the encryption bit for guest context pages due to insufficient validation of memory aliasing. The impact is loss of guest memory integrity when a hypervisor is already compromised or under attacker control.

## Affected products

- AMD Secure Encrypted Virtualization (SEV)

## 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 cache coherency integrity issue](https://junglewise.ai/threats/cve-2026-28249-improper-preservation-of-consistency-between-independent)