CVE-2022-2962 Denial of service in QEMU

High 7.8 Published 13 Sep 2022 Updated 23 Apr 2025

A malicious guest can crash the QEMU host process via a DMA reentrancy flaw in Tulip device emulation, causing denial of service.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2022-2962?

CVE-2022-2962 is a high-severity denial of service vulnerability in Qemu Qemu, published on 13 Sep 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-662, CWE-400

Which versions are affected by CVE-2022-2962?

It affects 1 product.

Linux distribution packages (1)

qemu openSUSE:Tumbleweed All versions 7.1.0-2.1

Products include Qemu Qemu.

How do I fix CVE-2022-2962?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2022-2962 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-2962 exists.

All Qemu Qemu vulnerabilities

Sources

Also known as AZL-10975, AZL-35159, DEBIAN-CVE-2022-2962, GHSA-wmwv-5vwp-c54w, openSUSE-SU-2024:12393-1.