Fix for SMM “Incursion” attack for some Lenovo laptops

Some Lenovo machines contained incursion vulnerabilities that allow breaking into System Management Mode (SMM). While most recent ThinkPads are affected, there are also some affected consumer machines. Lenovo describes the vulnerabilities as follows: Some BIOS implementations permit unsafe System Management Mode (SMM) function calls to memory locations outside of System Management RAM (SMRAM). An attacker …