kernel is vulnerable to denial of service (DoS). The vulnerability exists as an off-by-one flaw was found in the __addr_ok()
macro in the Linux kernel’s Xen hypervisor implementation when running on 64-bit systems. A privileged guest user could trigger this flaw to cause the hypervisor to crash.
rhn.redhat.com/errata/RHSA-2011-1212.html
secunia.com/advisories/55082
security.gentoo.org/glsa/glsa-201309-24.xml
www.openwall.com/lists/oss-security/2011/09/02/2
access.redhat.com/errata/RHSA-2011:1212
access.redhat.com/errata/RHSA-2011:1813
access.redhat.com/security/cve/CVE-2011-2901
access.redhat.com/security/updates/classification/#important
bugzilla.redhat.com/show_bug.cgi?id=728042
docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.7_Technical_Notes/kernel.html#RHSA-2011-1212