CVE-2021-3611 Denial of service in QEMU
A malicious guest can crash the QEMU host process via a stack overflow in the Intel HD Audio device, 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-2021-3611?
CVE-2021-3611 is a medium-severity denial of service vulnerability in Qemu Qemu, published on 11 May 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A stack overflow vulnerability was found in the Intel HD Audio device (intel-hda) of QEMU. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability. This flaw affects QEMU versions prior to 7.0.0.
Which versions are affected by CVE-2021-3611?
It affects 2 products.
Linux distribution packages (2)
qemu SUSE:Linux Enterprise Micro 5.3 | All versions | 6.2.0-150400.37.40.1 |
qemu SUSE:Linux Enterprise Micro 5.4 | All versions | 6.2.0-150400.37.40.1 |
Products include Qemu Qemu, Redhat Enterprise Linux.
How do I fix CVE-2021-3611?
Upgrade to a fixed version.
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-2021-3611 being exploited?
There is no known exploitation of CVE-2021-3611 in the wild and no public exploit code.
Other vulnerabilities in Qemu Qemu
Sources
Also known as AZL-35150, DEBIAN-CVE-2021-3611, GHSA-rj8x-cp5p-j26r, SUSE-SU-2025:0432-1, UBUNTU-CVE-2021-3611.