Function has_x86_ssb_bug 

pub fn has_x86_ssb_bug(
    cpuid: &impl Cpuid,
    msr: &impl ReadReg<ArchCapabilitiesMsr>,
) -> bool

Whether the CPU is susceptible to the Speculative Store Bypass (SSB) bug: https://software.intel.com/security-software-guidance/advisory-guidance/speculative-store-bypass

CVE-2018-3639.