CVE-2023-52934

The CVE-2023-52934 entry concerns the Linux kernel MADV_COLLAPSE path in mm/madvise. A commit changing find_pmd_or_thp_or_none() from returning SCAN_PMD_NULL when !pmd_present(pmde) to returning SCAN_PMD_NONE when pmd_none(pmde) was introduced to better distinguish none-pmd vs absent/present-pmd ...