There is indeed some work on memory tagging happening on ARM, including a new hardware extension. This (excellent) talk covers it: https://cppcon2018.sched.com/

There is indeed some work on memory tagging happening on ARM, including a new hardware extension. This (excellent) talk covers it: https://cppcon2018.sched.com/event/FnJs/memory-tagging-and-how-it-improves-c-memory-safety https://cppcon2018.sched.com/event/FnJs/memory-tagging-and-h... So it is not impossible Azure Sphere would explore it.