CVE-2012-3495

The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and
Citrix XenServer 6.0.2 and earlier uses the return value of the
get_free_pirq function as an array index without checking that the return
value indicates an error, which allows guest OS users to cause a denial of
service (invalid memory write and host crash) and possibly gain privileges
via unspecified vectors.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=686764&gt;

Notes