PHYSDEVOP_get_free_pirq does not check that its call to get_free_pirq succeeded, and if it fails will use the error code as an array index. A malicious guest might be able to cause the host to crash, leading to a DoS, depending on the exact memory layout. Privilege escalation is a theoretical possibility which cannot be ruled out, but is considered unlikely Acknowledgements: Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Matthew Daley as the original reporter.
Statement: Not vulnerable. This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5. This issue did not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.
Now public via: http://seclists.org/oss-sec/2012/q3/377
Created xen tracking bugs for this issue Affects: fedora-all [bug 854589]
xen-4.1.3-2.fc16 has been pushed to the Fedora 16 stable repository. If problems still persist, please make note of it in this bug report.