Final answer:
A memory access violation in NX occurs when a program tries to execute code from a protected non-executable memory region, leading to a system protection fault and possible termination of the offending program to maintain security.
Step-by-step explanation:
A memory access violation in NX (No eXecute) refers to an error that occurs when a program tries to access a region of memory improperly, often due to attempting to execute code from a region of memory that is marked as non-executable. The NX bit is a technology used in modern CPUs to segregate areas of memory for use by either storage of processor instructions (executable) or for storage of data (non-executable), which helps in preventing malicious programs like viruses and worms from executing code where it's not meant to be executed. When the violation occurs, it typically triggers a protection fault, and the operating system may respond by terminating the program or taking other corrective actions to preserve system stability and security.