So there's a "little" exploit in the Tegra X1 SoC that allows users to bypass its protections and load arbitrary code into its trusted zone. This is a pretty huge exploit, allowing devices with the Tegra X1 to be pwned pretty thoroughly. There's no real way to fix this, either, since the issue is in the chip's bootloader.
So, why is this in Gaming? Simple: the Switch uses the Tegra X1. If you have any interest in Switch homebrew, you're probably going to want to pick one up before NVIDIA releases updated silicon.
Now even though arbitrary code execution is unpreventable, bear in mind that Nintendo can still put measures in place to detect any shady activity and ban hacked users from their online services. If actual homebrew picks up in a big way after this I'll probably grab a second Switch for licensed gaming and use my first generation hardware strictly for homebrew.