DMA Reentrancy Vulnerability in NVME Emulation for QEMU
CVE-2021-3929

8.2HIGH

Key Information:

Vendor: Qemu
Status: Qemu
Vendor: CVE Published:; 25 August 2022

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👾 Exploit Exists🟡 Public PoC

What is CVE-2021-3929?

A DMA reentrancy issue exists within the NVM Express Controller (NVME) emulation in QEMU, leading to a use-after-free condition. When a reentrant write triggers the reset function nvme_ctrl_reset(), it causes data structures to be freed improperly. This vulnerability allows a malicious guest to crash the QEMU process on the host. In certain scenarios, this flaw may lead to a denial of service, and it could potentially allow the execution of arbitrary code within the context of the QEMU process on the host, exposing systems to further risks.

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Affected Version(s)

QEMU Fixed in qemu-kvm 7.0.0-rc0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-3929-3947
Created by QiuhaoLi