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A DMA reentrancy issue was found in the Tulip device emulation in QEMU. When Tulip reads or writes to the rx/tx descriptor or copies the rx/tx frame, it doesn't check whether the destination address is its own MMIO address. This can cause the device to trigger MMIO handlers multiple times, possibly leading to a stack or heap overflow. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.

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未加控制的资源消耗(资源穷尽)

QEMU 缓冲区错误漏洞

QEMU（Quick Emulator）是法国法布里斯-贝拉（Fabrice Bellard）个人开发者的一套模拟处理器软件。该软件具有速度快、跨平台等特点。 QEMU 存在安全漏洞，该漏洞源于其Tulip设备仿真中发现了DMA重入问题。当 Tulip 读取或写入 rx/tx 描述符或复制 rx/tx 帧时，它不会检查目标地址是否为其自己的MMIO地址。这可能导致设备多次触发MMIO处理程序，从而导致栈或堆的缓冲区溢出。攻击者可能使用此漏洞使主机上的QEMU 进程崩溃，从而导致拒绝服务情况。

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