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-2017-7995 medium priority: Ubuntu including 1 source packages (xen), 6 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): not-affected 3, DNE 1, ignored 1, needs-triage 1.
Xen PV guest before Xen 4.3 checked access permissions to MMIO ranges only after accessing them, allowing host PCI device space memory reads, leading to information disclosure. This is an error in the get_user function. NOTE: the upstream Xen Project considers versions before 4.5.x to be EOL.