Kaspersky/Securelist researchers detail zero-click iPhone exploit involving four distinct zero-day vulnerabilities, including undocumented hardware features in iPhone chips
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Operation Triangulation: The last (hardware) mystery
https://securelist.com/operation-triangulation-the-last-hardware-mystery/111669/
Recent iPhone models have additional hardware-based security protection for sensitive regions of the kernel memory. We discovered that to bypass this hardware-based security protection, the attackers used another hardware feature of Apple-designed SoCs.