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-2015-7985 low priority: Ubuntu including 1 source packages (steam), 5 status rows across 5 suites (precise, trusty, upstream, vivid, wily): DNE 2, not-affected 2, needs-triage 1.
Valve Steam 2.10.91.91 uses weak permissions (Users: read and write) for the Install folder, which allows local users to gain privileges via a Trojan horse steam.exe file.