CVE-2026-43348

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the mshv vtl component when registering VTL0 memory via 'MSHV ADD VTL0 MEMORY'. The kernel calculates pgmap->vmemmap shift based on the trailing zeros of start pfn and last pfn to determine the largest compound page order. Because this value is not clamped to MAX FOLIO ORDER, a sufficiently aligned physical range can produce a shift value exceeding what memremap pages() accepts. This results in a warning and the return of an -EINVAL error. Additionally, the error path incorrectly hard-coded -EFAULT, which masked the actual -EINVAL return from devm memremap pages().

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.