This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5 and 6, and Red Hat Enterprise MRG, as those versions have a guard page between the end of the user-mode accessible virtual address space and the beginning of the non-canonical area due to CVE-2005-1764 fix.
This issue did affect the versions of Xen hypervisor as shipped with Red Hat Enterprise Linux 5. A kernel-xen update for Red Hat Enterprise Linux 5 is available to address this flaw.
CVSS v2 metrics
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
|Access Vector||Adjacent Network|
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-2012:0721||2012-06-12|
Affected Packages State
|Red Hat Enterprise Linux 5||kernel-xen||Affected|
|Red Hat Enterprise Linux 6||kernel||Not affected|
|Red Hat Enterprise MRG 2||realtime-kernel||Not affected|