View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2016-4962 medium priority: Ubuntu including 1 source packages (xen), 5 status rows across 5 suites (precise, trusty, upstream, wily, xenial): released 3, ignored 1, needs-triage 1.
The libxl device-handling in Xen 4.6.x and earlier allows local OS guest administrators to cause a denial of service (resource consumption or management facility confusion) or gain host OS privileges by manipulating information in guest controlled areas of xenstore.