SWAPGS — CVE-2019-1125
SWAPGS, aka Grand Schemozzle, is a variant of Spectre v1, where conditional branches in the entry paths
which contain a
SWAPGS instruction (interrupts and exceptions) can be
mis-speculated which results in speculative accesses with a wrong GS base.
The Linux kernel documentation has a nice documentation about the nitty-gritty details.