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SYNTHESIS OF THE VULNERABILITY

A privileged attacker, located in a guest KVM system, can corrupt
the memory of vhost, in order to stop the host system, or to
execute code.

Impacted products: Linux, RHEL

Severity: 2/4

Creation date: 20/02/2013

DESCRIPTION OF THE VULNERABILITY

The vhost driver is used to simulate devices for HVM.

The translate_desc() function of the drivers/vhost/vhost.c file
converts guest memory addresses (Guest Virtual Address) to host
addresses (Host Virtual Address). However, during this operation,
the computed size is sometimes too large.

A privileged attacker, located in a guest KVM system, can
therefore corrupt the memory of vhost, in order to stop the host
system, or to execute code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-memory-corruption-via-vhost-12441