A 32-Bit Overflow in SmileBasic 4 Opened a Partial Switch 2 Jailbreak
A security researcher has demonstrated a software-only partial jailbreak of the Switch 2, gaining “userland” access that he says allows homebrew, reverse engineering and modding of Switch 2 games, save backups, and access to most peripherals through MMIO.
The hack relies on the original Switch version of SmileBasic 4, a programming environment and interpreter that runs on Nintendo hardware. The opening is a 32-bit integer overflow that occurs when removing items from an array in SmileBasic. That error gives access to an array pointer, which in turn allows read and write access to portions of system memory.
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The tethered qualifier matters: the hack requires a macOS or Linux PC on the same network running a node.js package to help enable privileged system access. That makes it a lab demonstration, not a portable, everyday exploit.
The lab setup is the interesting part, though. The researcher used Codex with a custom harness that sent USB commands and read results over HDMI; after about two weeks, the harness found the 32-bit overflow. That is AI as instrumentation, not AI as oracle.