# CVE-2025-54509: AMD IOMMU improper access control in register interface

Source: https://junglewise.ai/threats/cve-2025-54509-amd-iommu-improper-access-control-in-register-interface  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-09. Updated: 2026-06-09  
License: CC BY 4.0 with a link back

CVE-2025-54509 · Severity: info · CVSS 5.1 · Published 2026-06-09

A security vulnerability exists in the hardware component of AMD processors that manages how devices interact with system memory. A highly privileged attacker, such as a malicious administrator, could exploit this to bypass certain security protections within the AMD Secure Processor. This could lead to a loss of system integrity, potentially allowing unauthorized modifications to sensitive hardware-level operations.

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

## Quick answers

**Is CVE-2025-54509 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-54509 being exploited in the wild.

**How severe is CVE-2025-54509?** Informational severity, with a CVSS score of 5.1, published 9 June 2026.

**Which products and versions are affected?** AMD IOMMU.

**Is there a fix for CVE-2025-54509?** 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-2025-54509 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2025-54509?** Check whether you run Amd IOMMU. 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 classified as CWE-1262 (Improper Access Control for Register Interface) within the AMD Input-Output Memory Management Unit (IOMMU). A local attacker with high privileges (PR:H) can exploit improper access controls on the register interface to trigger non-coherent memory accesses by the AMD Secure Processor (ASP). This condition can be leveraged to bypass integrity protections enforced by the ASP. The attack requires specific architectural conditions (AT:P) but does not require user interaction. Mitigation typically involves firmware or BIOS updates from the original equipment manufacturer (OEM).

## Affected products

- AMD IOMMU

## Timeline

- 2026-06-09: disclosed: Initial disclosure by AMD
- 2026-06-09: advisory: NVD record published

## References

- [https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3039.html](https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3039.html)

## Related threats

- [AMD IOMMU out-of-bounds read in hypervisor](https://junglewise.ai/threats/cve-2024-21963-an-out-of-bounds-read-vulnerability-in-the-iommu-could-allow-a)