Description of problem:
The vmx_set_msr function in arch/x86/kvm/vmx.c in the VMX implementation in the KVM subsystem in the Linux kernel before 22.214.171.124 on the i386 platform allows guest OS users to cause a denial of service (OOPS) by setting the EFER_LME (aka "Long mode enable") bit in the Extended Feature Enable Register (EFER) model-specific register, which is specific to the x86_64 platform.
The bug was introduced in 6aa8b732ca (Dec 10, 2006).
This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 2.1, 3, 4, 5 or Red Hat Enterprise MRG.
kernel-126.96.36.199-170.2.68.fc10 has been submitted as an update for Fedora 10.
kernel-188.8.131.52-170.2.68.fc10 has been pushed to the Fedora 10 stable repository. If problems still persist, please make note of it in this bug report.