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CVE-2021-47110

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: x86/kvm: Disable kvmclock on all CPUs on shutdown Currenly, we disable kvmclock from machine_shutdown() hook and this only happ…

Published Mar 15, 2024CWE-459EPSS 0.24%

Overview

CVE-2021-47110 is a high-severity vulnerability. It was published on March 15, 2024 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, 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: Disable kvmclock on all CPUs on shutdown

Currenly, we disable kvmclock from machine_shutdown() hook and this

only happens for boot CPU. We need to disable it for all CPUs to

guard against memory corruption e.g. on restore from hibernate.

Note, writing '0' to kvmclock MSR doesn't clear memory location, it

just prevents hypervisor from updating the location so for the short

while after write and while CPU is still alive, the clock remains usable

and correct so we don't need to switch to some other clocksource.

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/1df2dc09926f61319116c80ee85701df33577d70Refgit.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6Refgit.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799aRefgit.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046Refgit.kernel.org/stable/c/1df2dc09926f61319116c80ee85701df33577d70Refgit.kernel.org/stable/c/3b0becf8b1ecf642a9edaf4c9628ffc641e490d6Refgit.kernel.org/stable/c/9084fe1b3572664ad276f427dce575f580c9799aRefgit.kernel.org/stable/c/c02027b5742b5aa804ef08a4a9db433295533046

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47110?

CVE-2021-47110 is a high-severity vulnerability. It was published on March 15, 2024 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2021-47110?

This vulnerability has a CVSS 3.1 base score of 7.1, 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-2021-47110?

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-2021-47110?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47110 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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