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**Name of the Vulnerable Software and Affected Versions** AMD Ryzen processor with AGESA microcode through 2017-01-27 **Description** The issue allows local users to cause a denial of service, resulting in a system hang, by executing a long series of FMA3 instructions. This can be demonstrated using the Flops test suite. **Recommendations** For AMD Ryzen processor with AGESA microcode through 2017-01-27, consider avoiding the execution of long series of FMA3 instructions to prevent system hangs. As a temporary workaround, restrict the use of applications that heavily utilize FMA3 instructions until a fix is available.