Use After Free Affecting qemu package, versions <1:6.1+dfsg-6
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Test your applications- Snyk ID SNYK-DEBIANUNSTABLE-QEMU-1577281
- published 31 Aug 2021
- disclosed 23 Mar 2022
Introduced: 31 Aug 2021
CVE-2021-3748 Open this link in a new tabHow to fix?
Upgrade Debian:unstable
qemu
to version 1:6.1+dfsg-6 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream qemu
package and not the qemu
package as distributed by Debian
.
See How to fix?
for Debian:unstable
relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2021-3748
- 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/
- https://security.gentoo.org/glsa/202208-27
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html