CWE-414 (加锁检查缺失) — Vulnerability Class 3

CWE-414, Missing Lock Check, is a concurrency weakness where software fails to verify the presence of an existing lock before executing sensitive operations on shared resources. This oversight typically allows multiple threads to access critical sections simultaneously, leading to race conditions that compromise data integrity or cause application crashes. Attackers exploit this by triggering concurrent requests that bypass expected synchronization, potentially manipulating state or extracting sensitive information through timing attacks. To prevent this, developers must rigorously implement proper locking mechanisms, ensuring that every access to shared data is preceded by a check for lock acquisition. Using atomic operations, mutexes, or semaphores correctly, and validating lock states before execution, ensures thread safety and maintains the consistency of shared resources against concurrent interference.