A new unpatchable iPhone exploit could allow permanent jailbreaking on hundreds of millions of Apple’s iconic devices. Researcher axi0mX says the newly discovered iOS exploit, dubbed “checkm8” could lead to a permanent, un-blockable jailbreak on hundreds of millions of iPhones.

Axi0mX said the exploit is a vulnerability that could give hackers deep access to iOS devices on a level that Apple would be unable to block or patch out with a future software update, making it one of the biggest developments in the iPhone hacking community in years.

Hundreds of millions of iPhone devices have been affected by the exploit, from the iPhone 4S through to the iPhone X.

Apple patched the flaw in last year’s A12 processors, meaning that iPhone XS-XR and 11 and 11 Pro devices aren’t affected.

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