CVE-2022-48797 mm: don't try to NUMA-migrate COW pages that have other uses

In the Linux kernel, the following vulnerability has been resolved: mm: don't try to NUMA-migrate COW pages that have other uses Oded Gabbay reports that enabling NUMA balancing causes corruption with his Gaudi accelerator test load: "All the details are in the bug, but the bottom line is that...

CVE-2022-48797

CVE-2022-48797 concerns a Linux kernel issue where NUMA balancing could alter COW page writability. The bug was traced to change_pte_range() using page_mapcount(page) to decide NUMA protection, which is incorrect; the recommended fix is to use page_count() (as reported by Oded Gabbay). Connected ...