CPU Hardware Not Configured to Support Exclusivity of Write and Execute Operations

Modern processors include a dedicated hardware mechanism, often a special control bit or a Memory Management Unit (MMU), to create exclusive memory regions. These regions are clearly designated as either for code (executable but not writable) or for data (writable but not executable). This hardware-enforced exclusivity is a foundational security feature that operating systems rely on to prevent code injection attacks. If this hardware feature is missing, disabled, or improperly configured—common in some embedded systems or CPUs without an MMU—the critical barrier between data and code disappears. An attacker can then exploit this by writing malicious instructions into a memory area and subsequently forcing the CPU to execute them, bypassing software-based protections.