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CVE-2021-47389

5.1 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: fix missing sev_decommission in sev_receive_start DECOMMISSION the current SEV context if binding an ASID fails after…

Published May 21, 2024CWE-772EPSS 0.21%

Overview

CVE-2021-47389 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

KVM: SVM: fix missing sev_decommission in sev_receive_start

DECOMMISSION the current SEV context if binding an ASID fails after

RECEIVE_START. Per AMD's SEV API, RECEIVE_START generates a new guest

context and thus needs to be paired with DECOMMISSION:

The RECEIVE_START command is the only command other than the LAUNCH_START

command that generates a new guest context and guest handle.

The missing DECOMMISSION can result in subsequent SEV launch failures,

as the firmware leaks memory and might not able to allocate more SEV

guest contexts in the future.

Note, LAUNCH_START suffered the same bug, but was previously fixed by

commit 934002cd660b ("KVM: SVM: Call SEV Guest Decommission if ASID

binding fails").

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

Refgit.kernel.org/stable/c/efd7866e114dcb44f86d151e843f8276b7efbc67Refgit.kernel.org/stable/c/f1815e0aa770f2127c5df31eb5c2f0e37b60fa77Refgit.kernel.org/stable/c/efd7866e114dcb44f86d151e843f8276b7efbc67Refgit.kernel.org/stable/c/f1815e0aa770f2127c5df31eb5c2f0e37b60fa77

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47389?

CVE-2021-47389 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.1 (MEDIUM).

How severe is CVE-2021-47389?

This vulnerability has a CVSS 3.1 base score of 5.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47389?

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-2021-47389?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47389 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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