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SYNTHESIS OF THE VULNERABILITY

A local attacker can manipulate the memory of a HVM Xen guest
system, in order to trigger a denial of service.

Impacted products: Unix (platform)

Severity: 1/4

Creation date: 14/08/2014

DESCRIPTION OF THE VULNERABILITY

A Xen guest system can be configured with more than 128Gbytes of
RAM.

However, as the paging_free_log_dirty_bitmap() function, and its
associated functions, are not preemptible, a local attacker can
temporarily block systems with such large memory capacity.

A local attacker can therefore manipulate the memory of a HVM Xen
guest system, in order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Xen-denial-of-service-via-log-dirty-15192