DMA Reentrancy Vulnerability in QEMU USB EHCI Controller Emulation

CVE-2021-3750

What is CVE-2021-3750?

A DMA reentrancy issue was identified in the USB EHCI controller emulation of QEMU, where the controller fails to verify if the Buffer Pointer intersects with its MMIO region during USB packet transfers. This oversight allows crafted content to manipulate registers within the controller, potentially leading to unwanted operations like resets while active transfers are ongoing. The vulnerability poses serious risks, as a malicious guest could exploit this flaw to crash the QEMU process on the host machine, causing a denial of service, or may even execute arbitrary code in the context of the QEMU process, affecting the host's stability and security.

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