Flash Player versions 31.0.0.148 and earlier have a type confusion vulnerability. Successful exploitation could lead to arbitrary code execution.
Published: 2018-11-21
Adobe has released an out-of-band patch for a critical Flash Player vulnerability. Users are encouraged to upgrade as soon as possible. Background On November 20, Adobe released APSB18-44, an out-of-band (OOB) security bulletin to address a zero day vulnerability in Adobe Flash Player versions 31.0.0.148 and earlier for Windows, macOS, Linux and Chrome OS.
https://helpx.adobe.com/security/products/flash-player/apsb18-44.html
https://access.redhat.com/errata/RHSA-2018:3644