In QEMU 4.2.0, a MemoryRegionOps object may lack read/write callback methods, leading to a NULL pointer dereference. A NULL pointer dereference flaw was found in various system emulators of QEMU that occurs while performing MMIO r/w operations when the respective handler function is not defined. This flaw allows a privileged guest user to invoke the MMIO operation to crash the QEMU process on the host, resulting in a denial of service.
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