https://www.theregister.co.uk/2018/01/02/intel_cpu_design_flaw/

＞that Intel's CPUs speculatively execute code potentially without performing security checks.
...
＞That would allow ring-3-level user code to read ring-0-level kernel data.

投機的実行が仇になったようだね、リング3 コードがリング0 カーネルデータを読み込める、というのは最悪だねえ‥