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-2016-7942 low priority: Ubuntu including 1 source packages (libx11), 8 status rows across 8 suites (artful, bionic, precise, trusty, upstream, xenial, yakkety, zesty): ignored 4, released 4.
The XGetImage function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via vectors involving image type and geometry, which triggers out-of-bounds read operations.