In Android before 2018-04-05 or earlier security patch level on Qualcomm Snapdragon Automobile and Snapdragon Mobile SD 425, SD 430, SD 450, SD 625, SD 650/52, SD 820, and SD 820A, there is a TOCTOU vulnerability in the input validation for bulletin_board_read syscall. A pointer dereference is being validated without promising the pointer hasn't been changed by the HLOS program.