CVE-2021-20203

Name of the Vulnerable Software and Affected Versions QEMU versions up to v5.2.0

Description An integer overflow issue was found in the vmxnet3 NIC emulator of QEMU. This issue may occur if a guest supplies invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host, resulting in a Denial of Service (DoS) scenario.

Recommendations For QEMU versions up to v5.2.0, update to a version later than v5.2.0 to resolve the issue. As a temporary workaround, consider restricting the ability of guest users to supply invalid values for NIC parameters to minimize the risk of exploitation.