iOS devices on A5 to A11 chips are affected.
If you’re an iPhone (or iPad) user, then you may know about the concept of jailbreaking. It’s basically an exploit on Apple’s operating system that enables you to gain access to features that aren’t available by default. This will also give you access to various tools that will give more customizations on your iPhone.
That being said, since it’s an exploit on the operating system, it also means that anyone is able to gain access to your device, meaning that it will be vulnerable to security risks. Others will say it’s safe, but of course, there’s always the possibility of someone using this exploit to do something harmful to your device.
This is why you’d always get those regular software updates that aim to patch these vulnerabilities. But just last week, a new exploit named checkm8 was announced that took advantage of a bootrom vulnerability. The main difference is that checkm8 is a hardware exploit, which can’t be patched by an update.
Twitter user axi0mX said that checkm8 is permanent, and affects devices running Apple’s A5 to A11 chips, meaning that devices like the iPhone 4S all the way to the iPhone X will have the checkm8 vulnerability. It was confirmed however that checkm8 isn’t present on A12 and A13 chips, so the iPhone XS/iPhone XR line from last year and the recently released iPhone 11 series are not affected.
EPIC JAILBREAK: Introducing checkm8 (read "checkmate"), a permanent unpatchable bootrom exploit for hundreds of millions of iOS devices.
Most generations of iPhones and iPads are vulnerable: from iPhone 4S (A5 chip) to iPhone 8 and iPhone X (A11 chip). https://t.co/dQJtXb78sG
— axi0mX (@axi0mX) September 27, 2019
Apple hasn’t commented on the issue at the moment, but a serious hardware flaw like this is something that shouldn’t be taken lightly. Stay tuned as we update this article with more information about checkm8.