CVE-2026-90097
UnknownSummary
In the Linux kernel, the hv vmbus module attempts to clean up an uninitialized VMBus module for a non-nested root partition. hv_acpi_init() does nothing in that scenario but reports success, so the module is loaded. Later unloading tries to clean up never-initialized resources, resulting in memory faults and a panic.
Risk Assessment
Unloading the module may cause memory faults and a kernel panic, leading to system unavailability.
Recommendation
Update the Linux kernel to a version containing the fix where the VMBus module exit function performs the same check and does nothing for a non-nested root partition.
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Original NVD description (English source)
In 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS