Buffer overflow in Qemu
CVE-2021-4206
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.
Vulnerability class: Integer Overflow
EPSS: 0.008 (54.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Qemu
- Debian Debian_linux — versions 10.0, 11.0
- Redhat Enterprise_linux — versions 8.0
- N/a Qemu — versions qemu-kvm 7.0.0
Weakness classification (CWE)
References
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (Exploit, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-4206?
- CVE-2021-4206 is a high-severity vulnerability in Qemu, classified under Integer Overflow or Wraparound. CVSS score: 8.2/10. Published 2022-04-29.
- How severe is CVE-2021-4206?
- High severity. CVSS v3 base score is 8.2 out of 10.