Have not found anything definitive, but I think it was fixed starting with Zen 3. https://wccftech.com/amd-and-intel-cpus-remain-vulnerable-to-spectre-v2-vulne

Have not found anything definitive, but I think it was fixed starting with Zen 3. https://wccftech.com/amd-and-intel-cpus-remain-vulnerable-to-spectre-v2-vulnerabilities-even-after-patches/ https://wccftech.com/amd-and-intel-cpus-remain-vulnerable-to... https://www.amd.com/en/corporate/product-security https://www.amd.com/en/corporate/product-security https://meltdownattack.com/ https://meltdownattack.com/ Likely need to dig into PDFs to get answers.