An arbitrary memory write flaw was found in the way Mozilla products deal with an out of memory (OOM) condition. If all memory is consumed, it is possible for arbitrary data to written using array offsets.
This is public via: http://www.mozilla.org/security/announce/2011/mfsa2011-12.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Via RHSA-2011:0473 https://rhn.redhat.com/errata/RHSA-2011-0473.html
This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2011:0475 https://rhn.redhat.com/errata/RHSA-2011-0475.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Red Hat Enterprise Linux 5 Via RHSA-2011:0474 https://rhn.redhat.com/errata/RHSA-2011-0474.html
This issue has been addressed in following products: Red Hat Enterprise Linux 5 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 4 Via RHSA-2011:0471 https://rhn.redhat.com/errata/RHSA-2011-0471.html