AMD SMM Supervisor Vulnerability Security Notice

Bulletin ID:     AMD-SB-7011
Potential Impact: Loss of confidentiality, integrity, and availability
Severity: High

Summary

External researchers reported a potential vulnerability during SMM Supervisor initialization which may impact some AMD processors.

On systems that do not have Supervisor Mode Execution Prevention (SMEP) and Unprivileged Mode Instruction Prevention (UMIP) enabled, an attacker with a compromised SMI handler may be able to gain Ring0 access due to improper input validation in the SMM supervisor which may lead to loss of confidentiality, integrity, and availability.

CVE Details

Refer to Glossary for explanation of terms

Affected Products

N/A

Mitigation

AMD has released to the Original Equipment Manufacturers (OEM) the Platform Initialization (PI) firmware versions on the dates listed below. Please refer to your OEM for the BIOS update specific to your product.

Desktop

Mobile - AMD Ryzen™ Series

Embedded

Acknowledgement

AMD thanks Enrique Nissim Krzysztof Okupski, and Joseph Tartaro of IOActive for reporting these issues.

Revisions 

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