The #zenbleed vulnerability (CVE-2023-20593) has been patched in edge and stable versions v3.15-v3.18 in #AlpineLinux. Make sure that the amd-ucode package is installed so that you get ucode updates. For consumer CPUs, AMD will only provide updates later this year. The latest kernel version will automatically toggle the chicken bit if the relevant ucode upgrades have not been applied.