CVE-2020-27661 Denial of service in n/a
A malicious guest can crash the QEMU host process via a divide-by-zero error in USB host controller 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-2020-27661?
CVE-2020-27661 is a medium-severity denial of service vulnerability in Qemu Qemu, published on 2 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A divide-by-zero issue was found in dwc2_handle_packet in hw/usb/hcd-dwc2.c in the hcd-dwc2 USB host controller emulation of QEMU. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service.
Weakness: CWE-369
Which versions are affected by CVE-2020-27661?
It affects 1 product.
Products include Qemu Qemu.
How do I fix CVE-2020-27661?
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-2020-27661 being exploited?
There is no known exploitation of CVE-2020-27661 in the wild and no public exploit code.
Other vulnerabilities in Qemu Qemu
Sources
Also known as DEBIAN-CVE-2020-27661, GHSA-pwg2-p5wp-g395.