system
Describe <CVE-2013-4494>.
user
What is <CVE-2013-4494>?
assistant
Xen before 4.1.x, 4.2.x, and 4.3.x does not take the page_alloc_lock and grant_table.lock in the same order, which allows local guest administrators with access to multiple vcpus to cause a denial of service (host deadlock) via unspecified vectors..