CVE-2026-31397

A flaw was found in the Linux kernel's memory management subsystem, specifically within the movepageshugepmd function. A local user could exploit a NULL pointer dereference when handling huge zero pages, which can lead to a system crash and a Denial of Service DoS. Furthermore, improper...

CVE-2026-31397

In the Linux kernel, the following vulnerability has been resolved: mm/hugememory: fix use of NULL folio in movepageshugepmd movepageshugepmd handles UFFDIOMOVE for both normal THPs and huge zero pages. For the huge zero page path, srcfolio is explicitly set to NULL, and is used as a sentinel to...

CVE-2026-31397

CVE-2026-31397 relates to the Linux kernel memory management path mm/huge_memory move_pages_huge_pmd(), where the huge zero page branch used a NULL src_folio, causing a bogus PFN (or NULL dereference on some memory models) when constructing PMDs. The fix uses page_folio(src_page) to obtain a vali...