Vulnerability · Published Mar 3, 2022 · Assigned by redhat
CVE-2021-3638
Medium 6.5
In plain English
A medium-severity out-of-bounds write in QEMU. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)0.4%top 62.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | qemu | 1:6.1+dfsg-6 | DEBIAN-CVE-2021-3638 |
| Debian:13 | qemu | 1:6.1+dfsg-6 | DEBIAN-CVE-2021-3638 |
| Debian:14 | qemu | 1:6.1+dfsg-6 | DEBIAN-CVE-2021-3638 |
| Ubuntu:22.04:LTS | qemu | 1:6.2+dfsg-2ubuntu6.16 | USN-6567-1 |
Affected products (as reported)
Weakness: CWE-787