The rio_ioctl function in drivers/net/ethernet/dlink/dl2k.c in the Linux kernel before 3.3.7 does not restrict access to the SIOCSMIIREG command, which allows local users to write data to an Ethernet adapter via an ioctl call.
Exploitability
AV:LAC:HAu:NImpact
C:NI:NA:P1.2/AV:L/AC:H/Au:N/C:N/I:N/A:P