The chip_command function in drivers/media/video/tvaudio.c in the Linux kernel 2.6.25.x before 2.6.25.19, 2.6.26.x before 2.6.26.7, and 2.6.27.x before 2.6.27.3 allows attackers to cause a denial of service (NULL function pointer dereference and OOPS) via unknown vectors.