CVE-2017-8831

The saa7164_bus_get function in drivers/media/pci/saa7164/saa7164-bus.c in the Linux kernel allows users able to plant rogue PCI device on the system to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact by changing a certain sequence-number value, aka a “double fetch” vulnerability.

Mitigation

This issue requires rogue PCI device to be planted on the system. Once such rogue PCI device is successfully planted however, attacker has usually more options for hostile takeover than just exploiting this issue. To mitigate this issue restrict physical access to your systems to only approved personnel (and generally follow general physical security guidelines) and do not use/insert into system PCI devices with unknown origin.