The hypervisor_callback function in Xen, possibly before 3.4.0, as applied to the Linux kernel 2.6.30-rc4, 2.6.18, and probably other versions allows guest user applications to cause a denial of service (kernel oops) of the guest OS by triggering a segmentation fault in "certain address ranges."
CVSS Severity (version 2.0):
Impact Subscore: 2.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
**NOTE: Access Complexity scored Low due to insufficient information
Authentication: Not required to exploit
Impact Type: Allows disruption of service
Official Statement from Red Hat (09/10/2009)
This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 2.1, 3, and Red Hat Enterprise MRG. It was addressed in Red Hat Enterprise Linux 4 and 5 via https://rhn.redhat.com/errata/RHSA-2009-1132.html and https://rhn.redhat.com/errata/RHSA-2009-1106.html .
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[Xen-devel] 20090513 [PATCH] linux/i386: hypervisor_callback adjustments
[oss-security] 20090514 CVE Request: XEN local denial of service
References to Check Content