This issue did not affect the Linux kernel as shipped with Red Hat Enterprise Linux 4 and 5 as they did not backport the upstream commit a8f80e8f that introduced this flaw. This has been addressed in Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-0498.html and https://rhn.redhat.com/errata/RHSA-2011-0500.html.
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Red Hat Security Errata
|MRG Grid for RHEL 5 Server (kernel-rt)||RHSA-2011:0500||2011-05-10|
|Red Hat Enterprise Linux 6 (kernel)||RHSA-2011:0498||2011-05-10|
AcknowledgementsRed Hat would like to thank Vasiliy Kulikov of Openwall for reporting this issue.
CVE description copyright © 2017, The MITRE Corporation