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-2016-4480 low priority: Ubuntu including 24 source packages (linux, linux-armadaxp, …), 120 status rows across 5 suites (precise, trusty, upstream, wily, xenial): DNE 70, not-affected 38, ignored 7, released 4, needs-triage 1.
The guest_walk_tables function in arch/x86/mm/guest_walk.c in Xen 4.6.x and earlier does not properly handle the Page Size (PS) page table entry bit at the L4 and L3 page table levels, which might allow local guest OS users to gain privileges via a crafted mapping of memory.