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CVE-2021-47062

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs Use the kvm_for_each_vcpu() helper to iterate over vCPUs w…

Published Feb 29, 2024CWE-476EPSS 0.22%

Overview

CVE-2021-47062 is a medium-severity vulnerability. It was published on February 29, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

KVM: SVM: Use online_vcpus, not created_vcpus, to iterate over vCPUs

Use the kvm_for_each_vcpu() helper to iterate over vCPUs when encrypting

VMSAs for SEV, which effectively switches to use online_vcpus instead of

created_vcpus. This fixes a possible null-pointer dereference as

created_vcpus does not guarantee a vCPU exists, since it is updated at

the very beginning of KVM_CREATE_VCPU. created_vcpus exists to allow the

bulk of vCPU creation to run in parallel, while still correctly

restricting the max number of max vCPUs.

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/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40Refgit.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2Refgit.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1Refgit.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40Refgit.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2Refgit.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47062?

CVE-2021-47062 is a medium-severity vulnerability. It was published on February 29, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47062?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47062?

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-2021-47062?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47062 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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