CVE-2021-4206: Integer Overflow
First published: Tue Jan 04 2022(Updated: )
A flaw was found in the QXL display device emulation in QEMU. An integer overflow in the cursor_alloc() function can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. This flaw allows a malicious privileged guest user to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU qemu | <7.0.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| redhat/qemu-kvm | <7.0.0 | 7.0.0 |
| debian/qemu | 1:5.2+dfsg-11+deb11u3 1:5.2+dfsg-11+deb11u2 1:7.2+dfsg-7+deb12u7 1:9.2.0+ds-2 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2036998
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
- https://security.gentoo.org/glsa/202208-27
- https://starlabs.sg/advisories/21-4206/
- https://www.debian.org/security/2022/dsa-5133
- https://launchpad.net/bugs/cve/CVE-2021-4206
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2070903
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2070901
- https://starlabs.sg/advisories/21/21-4206
- https://access.redhat.com/security/cve/CVE-2021-4206
- https://access.redhat.com/security/cve/CVE-2022-4206
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2036998#c7
- https://gitlab.com/qemu-project/qemu/-/commit/fa892e9a
- https://access.redhat.com/errata/RHSA-2022:5002
- https://access.redhat.com/security/cve/cve-2021-4206
- https://access.redhat.com/errata/RHSA-2022:5821
- https://starlabs.sg/advisories/21/21-4206/
- https://gitlab.com/qemu-project/qemu/-/commit/fa892e9abb728e76afcf27323ab29c57fb0fe7aa
- https://security-tracker.debian.org/tracker/CVE-2021-4206
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4206
- https://nvd.nist.gov/vuln/detail/CVE-2021-4206
- https://ubuntu.com/security/CVE-2021-4206
Frequently Asked Questions
What is CVE-2021-4206?
CVE-2021-4206 is a vulnerability found in the QXL display device emulation in QEMU.
What is the severity of CVE-2021-4206?
The severity of CVE-2021-4206 is high with a CVSS score of 8.2.
How does CVE-2021-4206 impact Redhat Enterprise Linux 8.0?
CVE-2021-4206 impacts Redhat Enterprise Linux 8.0.
How can I fix CVE-2021-4206?
To fix CVE-2021-4206, update the affected software to version 7.0.0 or higher.
Where can I find more information about CVE-2021-4206?
You can find more information about CVE-2021-4206 at the following references: [1](https://bugzilla.redhat.com/show_bug.cgi?id=2036998), [2](https://starlabs.sg/advisories/21-4206/), [3](https://www.debian.org/security/2022/dsa-5133).
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