Denial of Service Vulnerability in Xen 4.10 MSR Emulation Infrastructure

CVE-2018-5244 · MEDIUM Severity

AV:L/AC:L/AU:N/C:N/I:N/A:C

In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. Unfortunately, one tracking structure isn't freed when a vcpu is destroyed. This allows guest OS administrators to cause a denial of service (host OS memory consumption) by rebooting many times.

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