CVE-2021-20203: Integer Overflow
First published: Fri Jan 29 2021(Updated: )
An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU qemu | <=5.2.0 | |
| Fedoraproject Fedora | =33 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| debian/qemu | <=1:5.2+dfsg-11+deb11u2 | 1:5.2+dfsg-11+deb11u3 1:7.2+dfsg-7+deb12u7 1:9.1.1+ds-2 1:9.1.1+ds-4 |
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Reference Links
- https://bugs.launchpad.net/qemu/+bug/1913873
- https://bugzilla.redhat.com/show_bug.cgi?id=1922441
- https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
- https://security.gentoo.org/glsa/202208-27
- https://launchpad.net/bugs/cve/CVE-2021-20203
- https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg07935.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1922719
- https://access.redhat.com/security/cve/cve-2021-20203
- https://gitlab.com/qemu-project/qemu/-/commit/d05dcd94aee88
- https://gitlab.com/qemu-project/qemu/-/issues/308
- https://bugs.launchpad.net/qemu/+bug/1890152
- https://gitlab.com/qemu-project/qemu/-/commit/d05dcd94aee88728facafb993c7280547eb4d645
- https://security-tracker.debian.org/tracker/CVE-2021-20203
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20203
- https://nvd.nist.gov/vuln/detail/CVE-2021-20203
- https://ubuntu.com/security/CVE-2021-20203
Frequently Asked Questions
What is CVE-2021-20203?
CVE-2021-20203 is an integer overflow issue found in the vmxnet3 NIC emulator of the QEMU virtualization software.
Which versions of QEMU are affected by CVE-2021-20203?
Versions up to and including v5.2.0 of QEMU are affected by CVE-2021-20203.
What is the severity of CVE-2021-20203?
CVE-2021-20203 has a severity rating of low, with a CVSS score of 3.2.
How can a privileged guest user exploit CVE-2021-20203?
A privileged guest user can exploit CVE-2021-20203 by supplying invalid values for rx/tx queue size or other NIC parameters, causing a crash in the QEMU process on the host.
How can I fix CVE-2021-20203?
To fix CVE-2021-20203, update QEMU to a version higher than v5.2.0.
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