Last month, on August 16, Debian’s Moritz Muehlenhoff announced the availability of an Intel microcode update that provided Speculative Store Bypass Disable (SSBD) support needed to address both the Spectre Variant 4 and Spectre Variant 3a security vulnerabilities. However, the Intel microcode update released last month was available only for some types of Intel CPUs, so now the Debian Project released an updated version that implements SSBD support for additional Intel CPU models to mitigate both Spectre V4 and V3a on Debian GNU/Linux 9 “Stretch” systems.