This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 3, 4 and 5 as they did not include upstream commit ab521dc0 that introduced the problem. This issue was addressed in Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2010-0631.html.
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Red Hat Security Errata
|MRG Grid for RHEL 5 Server (kernel-rt)||RHSA-2010:0631||2010-08-17|
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