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CVE-2022-49568

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: KVM: Don't null dereference ops->destroy A KVM device cleanup happens in either of two callbacks: 1) destroy() which is called…

Published Feb 26, 2025CWE-476EPSS 0.30%

Overview

CVE-2022-49568 is a medium-severity vulnerability. It was published on February 26, 2025 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: Don't null dereference ops->destroy

A KVM device cleanup happens in either of two callbacks:

1) destroy() which is called when the VM is being destroyed;

2) release() which is called when a device fd is closed.

Most KVM devices use 1) but Book3s's interrupt controller KVM devices

(XICS, XIVE, XIVE-native) use 2) as they need to close and reopen during

the machine execution. The error handling in kvm_ioctl_create_device()

assumes destroy() is always defined which leads to NULL dereference as

discovered by Syzkaller.

This adds a checks for destroy!=NULL and adds a missing release().

This is not changing kvm_destroy_devices() as devices with defined

release() should have been removed from the KVM devices list by then.

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/170465715a60cbb7876e6b961b21bd3225469da8Refgit.kernel.org/stable/c/3616776bc51cd3262bb1be60cc01c72e0a1959cfRefgit.kernel.org/stable/c/d4a5a79b780891c5cbdfdc6124d46fdf8d13dba1Refgit.kernel.org/stable/c/e8bc2427018826e02add7b0ed0fc625a60390ae5Refgit.kernel.org/stable/c/e91665fbbf3ccb268b268a7d71a6513538d813ac

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49568?

CVE-2022-49568 is a medium-severity vulnerability. It was published on February 26, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49568?

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-2022-49568?

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-2022-49568?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49568 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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