Drivers: hv: vmbus: Skip VMBus module cleanup for non-nested root partition

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90097
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:01 UTC
Updated2026-09-17 17:17:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Drivers: hv: vmbus: Skip VMBus module cleanup for non-nested root partition The VMBus module initialization function, hv_acpi_init(), currently does nothing when running in the root partition and root is not nested in another VM. But the initialization function reports success, so the VMBus module is indeed loaded. VMBus functionality is not actually needed, but the VMBus module must be loaded so that hv_vmbus_exists() can answer correctly. Furthermore, the mshv_root dependency on the VMBus module is needed as described in the commit message for 840b740a35bf ("mshv: Add conditional VMBus dependency"). Loading the VMBus module without actually initializing it causes failures if the module should later be unloaded. The module unload code tries to clean up things that were never initialized, resulting in memory faults and a panic. Fix this by having VMBus module exit function perform the same check for non-nested root partition, and do nothing in such a case, just like hv_acpi_init(). In the long run, the code that manages the Hyper-V provided SynIC should be refactored to better coordinate the requirements of root partition scenarios and normal VM scenarios, and to hopefully remove the hv_vmbus_exists() dependnecy between mshv_root and VMBus modules. Preventing the current unload failure scenario is an expediency until such a refactoring is done.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7e279d78664aa91107ebff4b03eca367967f5908 aa17842bbccaeaba7d05c166019d1c96a41bca54 git Not specified
CNA Linux Linux affected 7e279d78664aa91107ebff4b03eca367967f5908 4c19c302cc577bd6b466f6d8e97971777392c2fa git Not specified
CNA Linux Linux affected 7e279d78664aa91107ebff4b03eca367967f5908 cee0d90bceae1dee3bcc70f8d6b2ceb5b87deb42 git Not specified
CNA Linux Linux affected 5.12 Not specified
CNA Linux Linux unaffected 5.12 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/aa17842bbccaeaba7d05c166019d1c96a41bca54 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4c19c302cc577bd6b466f6d8e97971777392c2fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cee0d90bceae1dee3bcc70f8d6b2ceb5b87deb42 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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