Which term describes a condition where two actions occur in an indeterminate order, producing different results depending on timing?

• A. Buffer Overflows
• B. SQL Injection
• C. Cross-Site Scripting
• D. Race Conditions

Answer: (D)

Race conditions describe a situation where two actions contend for a shared resource and the program’s behavior depends on the order in which those actions occur, which is often indeterminate. When timing varies, the outcome can change between runs or environments. This happens because one operation may read or write data before another operation has finished, leading to unpredictable or inconsistent results. A common example is two threads updating a shared counter without synchronization, where both read the same value, increment, and write back, effectively losing one update. The remedy is to enforce proper synchronization—locks, mutexes, atomic operations, or memory barriers—to ensure operations occur in a controlled order and data remains consistent. The other terms refer to different security flaws: buffer overflows involve writing beyond allocated memory, SQL injection manipulates database queries, and Cross-Site Scripting injects scripts into webpages. They don’t describe timing-dependent nondeterministic behavior.