CVE-2021-3748

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

VendorProductVersions
n/aQEMU (virtio-net)Affects qemu v0.10.0 and above, Fixed In – v6.2.0-rc0 and above.

References

Timeline

Published
Mar 23, 2022
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-3748: High severity, CVSS 7.5 | Vulnix