CVE-2021-3638 Memory corruption in QEMU

What is CVE-2021-3638?

CVE-2021-3638 is a medium-severity memory corruption vulnerability in Fedoraproject Fedora, published on 3 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

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.

Weakness: CWE-787

Which versions are affected by CVE-2021-3638?

It affects 2 products.

Products include Fedoraproject Fedora, Qemu Qemu.

How do I fix CVE-2021-3638?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-3638 being exploited?

There is no known exploitation of CVE-2021-3638 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-8975, DEBIAN-CVE-2021-3638, GHSA-2r38-g5xg-3v7g, OESA-2022-1995, OESA-2022-1996, UBUNTU-CVE-2021-3638.