The kvm_emulate_hypercall function in arch/x86/kvm/x86.c in KVM in the
Linux kernel 2.6.25-rc1, and other versions before 2.6.31, when
running on x86 systems, does not prevent access to MMU hypercalls from
ring 0, which allows local guest OS users to cause a denial of service
(guest kernel crash) and read or write guest kernel memory via
unspecified "random addresses."
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[oss-security] 20090918 CVE request: kernel: KVM: x86: Disallow hypercalls for guest callers in rings > 0
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