When releasing a non-v1 non-transitive grant after doing a grant copy operation, Xen incorrectly recurses (as if for a transitive grant) and releases an unrelated grant reference. A malicious guest administrator can cause undefined behaviour; depending on the dom0 kernel a host crash is possible, but information leakage or privilege escalation cannot be ruled out. References: http://permalink.gmane.org/gmane.comp.security.oss.general/9978 Acknowledgements: Red Hat would like to thank the Xen for reporting this issue.
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 the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.
Created xen tracking bugs for this issue Affects: fedora-all [bug 953633]
xen-4.1.5-1.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.