I have not read the leaked docs, however from the description it sounds like the good old 0x24K bootrom exploit[0] which lasted through the earlier revisions of

I have not read the leaked docs, however from the description it sounds like the good old 0x24K bootrom exploit[0] which lasted through the earlier revisions of 3GS until it was patched in hardware. There were a few bootrom exploits but by the time iPhone 5 came out, this vector was mostly gone if not entirely and every jailbreak since then required an initial priviledge escalation in the userland. [0] https://www.theiphonewiki.com/wiki/0x24000_Segment_Overflow https://www.theiphonewiki.com/wiki/0x24000_Segment_Overflow