Adobe Security Bulletin APSB18-01 for Adobe Flash Player describes an out-of-bounds read flaw that can possibly lead to information disclosure when Flash Player is used to play a specially crafted SWF file.
Quoting from the APSB18-01:
Out-of-bounds Read Information Disclosure Important CVE-2018-4871
This issue has been addressed in the following products:
Red Hat Enterprise Linux 6 Supplementary
Via RHSA-2018:0081 https://access.redhat.com/errata/RHSA-2018:0081