The MITRE CVE dictionary describes this issue as:
The xen_failsafe_callback function in Xen for the Linux kernel 2.6.23 and other versions, when running a 32-bit PVOPS guest, allows local users to cause a denial of service (guest crash) by triggering an iret fault, leading to use of an incorrect stack pointer and stack corruption.
Find out more about CVE-2013-0190 from the
MITRE CVE dictionary dictionary and
This issue did not affect Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.