Adobe Flash Player versions 23.0.0.207 and earlier, 11.2.202.644 and earlier have an exploitable use after free vulnerability in the MovieClip class related to objects at multiple presentation levels. Successful exploitation could lead to arbitrary code execution.
https://security.gentoo.org/glsa/201701-17
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-154
http://www.zerodayinitiative.com/advisories/ZDI-16-626
https://helpx.adobe.com/security/products/flash-player/apsb16-39.html
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-8721
http://www.securitytracker.com/id/1037442
http://lists.opensuse.org/opensuse-updates/2016-12/msg00112.html
http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00064.html