Xen 4.4.x, 4.5.x, and 4.6.x does not limit the number of printk console messages when reporting unimplemented hypercalls, which allows local guests to cause a denial of service via a sequence of (1) HYPERVISORphysdevop hypercalls, which are not properly handled in the dophysdevop function in arch/arm/physdev.c, or (2) HYPERVISORhvmop hypercalls, which are not properly handled in the dohvmop function in arch/arm/hvm.c.
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