Lokesh Gidra

**Name of the Vulnerable Software and Affected Versions** Linux kernel (affected versions not specified) **Description** The issue concerns the userfaultfd feature in the Linux kernel, where the src folio is changed after ensuring it's unpinned in UFFDIO MOVE. A commit was made to fix an unexpected change to src folio when UFFDIO MOVE fails, which moved the src folio->{mapping, index} changing to after clearing the page-table and ensuring that it's not pinned. This avoids failure of swapout+migration and possibly memory corruption. However, the commit missed fixing it in the huge-page case. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.