Red Hat is aware of this issue and is tracking it via the following bug:
This issue did not affect the version of the Linux kernel as shipped with Red Hat Enterprise Linux 3 as it did not include support for ULE (Unidirectional Lightweight Encapsulation). We have included a fix for this issue in Red Hat Enterprise Linux 4, 5 and Red Hat Enterprise MRG however the affected module is not build by default.
CVSS v2 metrics
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
Red Hat Security Errata
|Red Hat Enterprise Linux 5 (kernel)||RHSA-2011:0429||2011-04-12|
|Red Hat Enterprise Linux 6 (kernel)||RHSA-2011:0421||2011-04-08|
|Red Hat Enterprise Linux 4 (kernel)||RHSA-2011:0263||2011-02-16|
|MRG Grid for RHEL 5 Server (kernel-rt)||RHSA-2011:0330||2011-03-10|