Buffer overflow in Qemu
CVE-2021-3638
An out-of-bounds memory access flaw was found in the ATI VGA device emulation of QEMU. This flaw occurs in the ati_2d_blt() routine while handling MMIO write operations when the guest provides invalid values for the destination display parameters. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (34.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Qemu
- Fedoraproject Fedora — versions 36, 37
- Qemu — versions Affects qemu v4.0 to v6.1
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- ubuntu.com/security/CVE-2021-3638 (Third Party Advisory)
- lists.nongnu.org/archive/html/qemu-devel/2021-09/msg01682.html (Exploit, Patch, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20220407-0003/ (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3638?
- CVE-2021-3638 is a medium-severity vulnerability in Qemu, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2022-03-03.
- How severe is CVE-2021-3638?
- Medium severity. CVSS v3 base score is 6.5 out of 10.