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CVE-2021-3750

8.2 · HIGH

A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU.

Published May 2, 2022CWE-416EPSS 0.51%

Overview

CVE-2021-3750 is a high-severity vulnerability. It was published on May 2, 2022 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU. EHCI does not verify if the Buffer Pointer overlaps with its MMIO region when it transfers the USB packets. Crafted content may be written to the controller's registers and trigger undesirable actions (such as reset) while the device is still transferring packets. This can ultimately lead to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition, or potentially execute arbitrary code within the context of the QEMU process on the host. This flaw affects QEMU versions before 7.0.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.redhat.com/show_bug.cgi?id=1999073Refgitlab.com/qemu-project/qemu/-/issues/541Refgitlab.com/qemu-project/qemu/-/issues/556Refsecurity.gentoo.org/glsa/202208-27Refsecurity.netapp.com/advisory/ntap-20220624-0003/Refbugzilla.redhat.com/show_bug.cgi?id=1999073Refgitlab.com/qemu-project/qemu/-/issues/541Refgitlab.com/qemu-project/qemu/-/issues/556Refsecurity.gentoo.org/glsa/202208-27Refsecurity.netapp.com/advisory/ntap-20220624-0003/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3750?

CVE-2021-3750 is a high-severity vulnerability. It was published on May 2, 2022 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2021-3750?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-3750?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-3750?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3750 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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