CVE-2026-93218 mm/huge_memory: skip device-private PMDs in madvise_free_huge_pmd

In the Linux kernel, the following vulnerability has been resolved: mm/hugememory: skip device-private PMDs in madvisefreehugepmd madvisefreepterange checks pmdtranshugepmd unlocked, then madvisefreehugepmd takes pmdtranshugelock. pmdishuge returns true for a device-private PMD, so origpmd can be...