CVE-2026-68163

A flaw was found in the Linux kernel's memory management subsystem. Incorrect handling of device-private Page Middle Directory (PMD) entries can lead to memory corruption. Specifically, when page_vma_mapped_walk() encounters these entries, it can misinterpret them as migration entries, resulting in memory corruption. Additionally, a race condition can occur during PMD splitting, further contributing to memory integrity issues.

This issue affects device-private memory mappings with PMD-sized entries. page_vma_mapped does not handle device-private PMDs correctly in rmap walks. Requires device-private memory configurations.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.