High severity · published Apr 29, 2022
CVE-2021-4206
A flaw was found in the QXL display device emulation in QEMU
8.2
CVSS
0.8%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
10.0; 11.0 · source: NVD
EL
Enterprise Linux · Redhat
8.0; 8.0 · source: NVD
QE
Qemu · Qemu
before 7.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-4206
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-4206
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2036998
Mailing List
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
Third Party Advisory
https://security.gentoo.org/glsa/202208-27
Exploit
https://starlabs.sg/advisories/21-4206/
Third Party Advisory
https://www.debian.org/security/2022/dsa-5133
security.netapp.com
https://security.netapp.com/advisory/ntap-20250321-0010/
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