Userland

Userland describes the software running on an iDevice after the kernel has started. A userland-based exploit or jailbreak, being entirely software-based, can be patched by Apple. Userland jailbreaks differ from jailbreaks that affect the boot chain of trust, in that they do not allow custom firmwares/IMG3 files to be flashed.

Existing userland jailbreaks include JailbreakMe Star and Saffron.