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CVE-2021-47407

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Handle SRCU initialization failure during page track init Check the return of init_srcu_struct(), which can fail due…

Published May 21, 2024CWE-476EPSS 0.25%

Overview

CVE-2021-47407 is a medium-severity vulnerability. It was published on May 21, 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: x86: Handle SRCU initialization failure during page track init

Check the return of init_srcu_struct(), which can fail due to OOM, when

initializing the page track mechanism. Lack of checking leads to a NULL

pointer deref found by a modified syzkaller.

[Move the call towards the beginning of kvm_arch_init_vm. - Paolo]

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/4664318f73e496cd22c71b10888e75434a123e23Refgit.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4Refgit.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfbRefgit.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23Refgit.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4Refgit.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfb

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47407?

CVE-2021-47407 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47407?

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-2021-47407?

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-2021-47407?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47407 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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