Security researchers discovered a security flaw in the NVIDIA Tegra X1 processor that is used by the Nintendo Switch console. The vulnerability makes it possible to run homebrew software on the Switch, and opens up the possibility of piracy. Direct physical access to the console is needed for exploitation, so the risk is minimal.
The flaw is described as unpatchable, as it is inside the boot and power management ROM of the Nvidia Tegra X1 used in the Switch. Users only need to initiate recovery mode on the console and the exploit can be triggered via a malformed packet sent during a routine USB device status check. Thence up to 65,535 bytes of extra data can be executed without question.
Nintendo will likely issue an update to mitigate the attack.