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Midrange vulnerabilities involve interactions among more than one location in code. Precisely detecting race conditions, for example, depends on more than simply analyzing an isolated line of code—it may depend on knowing about the behavior of several functions, understanding sharing among global variables, and being familiar with the operating system providing the execution environment.

From

Cover of Software Security: Building Security In

Note

A race condition occurs when two or more threads can access shared data and they try to change it at the same time. Because the thread scheduling algorithm can swap between threads at any time, you don't know the order in which the threads will attempt to access the shared data