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AMD CPU Branch Type Confusion

Description

**Bulletin ID:** AMD-SB-1037 **Potential Impact:** Information disclosure, arbitrary speculative code execution **Severity:**Medium ## Summary This security bulletin addresses two issues related to CVE-2017-5715 previously known as Spectre Variant 2. As part of our efforts to continue improving security features, AMD has investigated additional issues related to CVE-2017-5715. This security bulletin addresses subsequent potential issues. ## CVE Details CVE-2022-23825 (Branch Type Confusion_)_ Aliases in the branch predictor may cause some AMD processors to predict the wrong branch type potentially leading to information disclosure. CVE-2022-29900 (RETbleed) (aka CVE-2022-23816) Mis-trained branch predictions for return instructions may allow arbitrary speculative code execution under certain microarchitecture-dependent conditions. ## Affected Products Desktop * AMD Athlon™ X4 processor * AMD Ryzen™ Threadripper™ PRO processor * 2nd Gen AMD Ryzen™ Threadripper™ processors * 3rd Gen AMD Ryzen™ Threadripper™ processors * 7th Generation AMD A-Series APUs * AMD Ryzen™ 2000 Series Desktop processors * AMD Ryzen™ 3000 Series Desktop processors * AMD Ryzen™ 4000 Series Desktop processors with Radeon™ graphics Mobile * AMD Ryzen™ 2000 Series Mobile processor * AMD Athlon™ 3000 Series Mobile processors with Radeon™ Graphics * AMD Ryzen™ 3000 Series Mobile processors or 2nd Gen AMD Ryzen™ Mobile processors with Radeon™ graphics * AMD Ryzen™ 4000 Series Mobile processors with Radeon™ graphics * AMD Ryzen™ 5000 Series Mobile processors with Radeon™ graphics Chromebook * AMD Athlon™ Mobile processors with Radeon™ graphics Server * 1st Gen AMD EPYC™ processors * 2nd Gen AMD EPYC™ processors ## Mitigation AMD is recommending the software community follow the guidance found in our [Technical Guidance for Mitigating Branch Type Confusion](<https://www.amd.com/system/files/documents/technical-guidance-for-mitigating-branch-type-confusion_v7_20220712.pdf>)1 As of the date of this disclosure, AMD is not aware of any active exploits in the wild of AMD products relating to CVE-2017-5715.


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