This is a security update for Flash Player users on Windows, Mac, ChromOS and Linux Systems…
US-CERT says:
“Adobe has released security updates to address multiple vulnerabilities in Flash Player for Windows, Macintosh, ChromeOS, and Linux. Exploitation of some of these vulnerabilities may allow a remote attacker to take control of an affected system.
Users and administrators are encouraged to review Adobe Security Bulletin APSB15-23 and apply the necessary updates.”