A heap-based buffer overflow in the bx_ne2k_c::rx_frame function in
iodev/ne2k.cc in the emulated NE2000 device in Bochs 2.3 allows local users
of the guest operating system to write to arbitrary memory locations and
gain privileges on the host operating system via vectors that cause TXCNT
register values to exceed the device memory size, aka "RX Frame heap
overflow."