The IOCTL 9031 (BIOCGSTATS) handler in the NPF.SYS device driver in WinPcap before 4.0.1 allows local users to overwrite memory and execute arbitrary code via malformed Interrupt Request Packet (Irp) parameters.

Multiple array index errors in the bpf_filter_init function in NPF.SYS in WinPcap before 4.0.2, when run in monitor mode (aka Table Management Extensions or TME), and as used in Wireshark and possibly other products, allow local users to gain privileges via crafted IOCTL requests.