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CVE-2021-47112

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: x86/kvm: Teardown PV features on boot CPU as well Various PV features (Async PF, PV EOI, steal time) work through memory shared…

Published Mar 15, 2024EPSS 0.25%

Overview

CVE-2021-47112 is a high-severity vulnerability. It was published on March 15, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

x86/kvm: Teardown PV features on boot CPU as well

Various PV features (Async PF, PV EOI, steal time) work through memory

shared with hypervisor and when we restore from hibernation we must

properly teardown all these features to make sure hypervisor doesn't

write to stale locations after we jump to the previously hibernated kernel

(which can try to place anything there). For secondary CPUs the job is

already done by kvm_cpu_down_prepare(), register syscore ops to do

the same for boot CPU.

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/38b858da1c58ad46519a257764e059e663b59ff2Refgit.kernel.org/stable/c/7620a669111b52f224d006dea9e1e688e2d62c54Refgit.kernel.org/stable/c/8b79feffeca28c5459458fe78676b081e87c93a4Refgit.kernel.org/stable/c/d1629b5b925de9b27979e929dae7fcb766daf6b6Refgit.kernel.org/stable/c/38b858da1c58ad46519a257764e059e663b59ff2Refgit.kernel.org/stable/c/7620a669111b52f224d006dea9e1e688e2d62c54Refgit.kernel.org/stable/c/8b79feffeca28c5459458fe78676b081e87c93a4Refgit.kernel.org/stable/c/d1629b5b925de9b27979e929dae7fcb766daf6b6

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47112?

CVE-2021-47112 is a high-severity vulnerability. It was published on March 15, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47112?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2021-47112?

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-2021-47112?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47112 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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