We call this kernel saunters: How Apple rearranged its XNU core with exclaves

The report describes Apple’s emerging exclaves architecture in XNU (iOS/macOS), which isolates predefined resources and services from the main kernel using hardware-enforced page types and a new Secure Kernel to gain microkernel-like security benefits while retaining XNU’s hybrid model; references found in M4/A18 and iOS 18 suggest protected domains for shared memory, audio/sensor indicators, and callable services, with IPC reminiscent of seL4, aimed at reducing blast radius and increasing exploit complexity amid growing on-device AI workloads, though Apple has not officially detailed the feature as it is still in progress.