CVE-2026-43348
MediumSummary
In the Linux kernel, a vulnerability in the mshv_vtl component occurs when registering VTL0 memory via MSHV_ADD_VTL0_MEMORY, where the computed vmemmap_shift may exceed MAX_FOLIO_ORDER, leading to incorrect behavior.
Risk Assessment
The risk involves potential system instability or critical errors in environments using the Virtual Trust Level (VTL) mechanism on Microsoft Hyper-V platforms.
Recommendation
It is recommended to immediately update the Linux kernel to a version containing the fix for CVE-2026-43348, available in official distribution repositories.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: mshv_vtl: Fix vmemmap_shift exceeding MAX_FOLIO_ORDER When registering VTL0 memory via MSHV_ADD_VTL0_MEMORY, the kernel computes pgmap->vmemmap_shift as the number of trailing zeros in the OR of start_pfn and last_pfn, intending t