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CVE-2022-49098

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: vmbus: Fix potential crash on module unload The vmbus driver relies on the panic notifier infrastructure to perfor…

Published Feb 26, 2025EPSS 0.26%

Overview

CVE-2022-49098 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:

Drivers: hv: vmbus: Fix potential crash on module unload

The vmbus driver relies on the panic notifier infrastructure to perform

some operations when a panic event is detected. Since vmbus can be built

as module, it is required that the driver handles both registering and

unregistering such panic notifier callback.

After commit 74347a99e73a ("x86/Hyper-V: Unload vmbus channel in hv panic callback")

though, the panic notifier registration is done unconditionally in the module

initialization routine whereas the unregistering procedure is conditionally

guarded and executes only if HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE capability

is set.

This patch fixes that by unconditionally unregistering the panic notifier

in the module's exit routine as well.

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/2133c422a103cf7c7768c37b9ac382e73b691892Refgit.kernel.org/stable/c/3d0078f8bddd58d9bb1ad40bbe929f8633abb276Refgit.kernel.org/stable/c/5ea98d0f5f035c1bcf1517ccec0e024ae35a48b2Refgit.kernel.org/stable/c/6b4c0149a56147b29169e07000d566162892722aRefgit.kernel.org/stable/c/792f232d57ff28bbd5f9c4abe0466b23d5879dc8Refgit.kernel.org/stable/c/cf580d2e3884dbafd6b90269b03a24d661578624Refgit.kernel.org/stable/c/dcd6b1a624c0ffa21034d8b1e02e9d068458f596

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49098?

CVE-2022-49098 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-2022-49098?

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-2022-49098?

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-2022-49098?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49098 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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