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CVE-2021-3748

Published: 31 August 2021

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.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
impish
Released (1:6.0+dfsg-2expubuntu1.2)
kinetic
Released (1:6.2+dfsg-2ubuntu5)
upstream Needs triage

trusty Not vulnerable
(code not present)
bionic
Released (1:2.11+dfsg-1ubuntu7.39)
focal
Released (1:4.2-3ubuntu6.21)
xenial Not vulnerable
(code not present)
hirsute Ignored
(end of life)
jammy
Released (1:6.2+dfsg-2ubuntu5)
Patches:
upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=bedd7e93d01961fcb16a97ae45d93acf357e11f6

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Local
Attack complexity High
Privileges required High
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H