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-2016-9603 medium priority: Ubuntu including 3 source packages (qemu, qemu-kvm, xen), 18 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): DNE 5, released 5, not-affected 4, needs-triage 2, ignored 1, needed 1.
A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's VNC display driver support before 2.9; the issue could occur when a VNC client attempted to update its display after a VGA operation is performed by a guest. A privileged user/process inside a guest could use this flaw to crash the QEMU process or, potentially, execute arbitrary code on the host with privileges of the QEMU process.