Adobe has released security updates for Windows, Macintosh, Linux and Android on September 10



From Ubuntu Guide:

These updates address vulnerabilities that could cause a crash and potentially allow an attacker to take control of the affected system. Adobe recommends users update their product installations to the latest versions

For Ubuntu Linux, the flash plugin was upgraded from version 11.2.202.297 to version 11.2.202.310.

  Adobe Flash Player for Linux has Security Updates