CVE-2021-3748

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.

Bugs

• <https://bugzilla.redhat.com/show_bug.cgi?id=1998514&gt;