Apple’s T2 security chip is insecure and cannot be fixed, a group of security researchers report. Over the past three years, a handful of hackers have delved into the inner workings of the custom silicon, fitted inside recent Macs, and found that they can use an exploit developed for iPhone jailbreaking, checkm8, in conjunction with a memory controller vulnerability known as blackbird, to compromise the T2 on macOS computers.

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