S5L8940

This is the Apple A5 processor currently used in the iPad 2 and the iPhone 4S. Manufactured by Samsung, the processor itself is dual-core, with a processing speed of up to 1GHz.

Exploits
Userland Kernel
 * T1 Font Integer Overflow- Works up to iOS 4.3.3
 * MS bug- Works up to iOS 5.0.1