CVE-2021-3748 Information

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.

CVSS Vector

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

Reference

https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6 https://ubuntu.com/security/CVE-2021-3748 https://bugzilla.redhat.com/show_bug.cgi?id=1998514 https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.html https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html https://security.netapp.com/advisory/ntap-20220425-0004/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8