CVE-2021-4207

Description

A flaw was found in the QXL display device emulation in QEMU. A double fetch of guest controlled values `cursor->header.width` and `cursor->header.height` can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. A malicious privileged guest user could use this flaw to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.

How to fix CVE-2021-4207

To remediate CVE-2021-4207, upgrade the affected package to a fixed version below.

• —upgrade to 1:5.2+dfsg-11+deb11u2 or later

Is CVE-2021-4207 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 1:5.2+dfsg-11+deb11u2

CVSS scores

References (1)

• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-4207