Cortex-M has an MPU, not MMU to provide protection for memory regions. But as said above, the MPU/MMU has no effect on this bug, this is ab out speculative exe

Cortex-M has an MPU, not MMU to provide protection for memory regions. But as said above, the MPU/MMU has no effect on this bug, this is ab out speculative execution and determining information from a cache side channel attack.