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SYNTHESIS OF THE VULNERABILITY

An attacker can generate a buffer overflow in the virtnet_probe()
function of the Linux kernel, in order to trigger a denial of
service, and possibly to run code.

– Impacted products: Debian, Linux.
– Severity: 2/4.
– Creation date: 06/08/2015.

DESCRIPTION OF THE VULNERABILITY

A KVM guest system uses the drivers/net/virtio_net.c network
driver of the Linux kernel.

However, the NETIF_F_FRAGLIST option is used, so if the number of
fragments is greater than the size of the storage array, an
overflow occurs.

An attacker can therefore generate a buffer overflow in the
virtnet_probe() function of the Linux kernel, in order to trigger
a denial of service, and possibly to run code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-buffer-overflow-of-virtnet-probe-17601