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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 base score: 8.8

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
bionic
Released (1:2.11+dfsg-1ubuntu7.39)
focal
Released (1:4.2-3ubuntu6.21)
hirsute Ignored
(reached end-of-life)
impish
Released (1:6.0+dfsg-2expubuntu1.2)
jammy
Released (1:6.2+dfsg-2ubuntu5)
trusty Needed

upstream Needs triage

xenial Needed