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 | |
| ubuntu/qemu | <1:6.2+dfsg-2ubuntu8 | 1:6.2+dfsg-2ubuntu8 |
| ubuntu/qemu | <1:6.2+dfsg-2ubuntu8 | 1:6.2+dfsg-2ubuntu8 |
| ubuntu/qemu | <1:2.11+dfsg-1ubuntu7.40 | 1:2.11+dfsg-1ubuntu7.40 |
| ubuntu/qemu | <1:4.2-3ubuntu6.23 | 1:4.2-3ubuntu6.23 |
| ubuntu/qemu | <1:6.0+dfsg-2 | 1:6.0+dfsg-2 |
| ubuntu/qemu | <1:6.2+dfsg-2ubuntu6.2 | 1:6.2+dfsg-2ubuntu6.2 |
| ubuntu/qemu | <1:6.2+dfsg-2ubuntu8 | 1:6.2+dfsg-2ubuntu8 |
| redhat/qemu-kvm | <7.0.0 | 7.0.0 |
| debian/qemu | <=1:3.1+dfsg-8+deb10u8 | 1:3.1+dfsg-8+deb10u11 1:5.2+dfsg-11+deb11u3 1:5.2+dfsg-11+deb11u2 1:7.2+dfsg-7+deb12u3 1:8.2.1+ds-1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2036998
- https://starlabs.sg/advisories/21-4206/
- https://www.debian.org/security/2022/dsa-5133
- https://security.gentoo.org/glsa/202208-27
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
- 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/21-4206
- 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://starlabs.sg/advisories/22-4206/
- https://ubuntu.com/security/notices/USN-5489-1
- https://nvd.nist.gov/vuln/detail/CVE-2021-4206
- https://git.qemu.org/?p=qemu.git;a=commit;h=fa892e9abb728e76afcf27323ab29c57fb0fe7aa
- 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).
- agent/author
- agent/description
- agent/event
- agent/first-publish-date
- agent/last-modified-date
- agent/references
- agent/remedy
- agent/severity
- agent/softwarecombine
- agent/tags
- agent/type
- agent/weakness
- collector/launchpad-cve
- source/Launchpad
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- collector/nvd-index
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-4206
- collector/security-tracker-debian
- source/Debian
- collector/usn-cve
- source/Ubuntu
- vendor/qemu
- canonical/qemu qemu
- vendor/redhat
- canonical/redhat enterprise linux
- version/redhat enterprise linux/8.0
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/10.0
- version/debian debian linux/11.0
- package-manager/redhat
- package-manager/debian
- package-manager/ubuntu