CVE-2026-74591

CVE-2026-74591 is a bug in the Linux kernel 's mm/filemap subsystem, specifically in __filemap_add_folio(). In the split-a-conflict loop, repeated calls to xas_set_order() round down xas.xa_index. When a GFP_NOWAIT allocation fails and the lock is dropped for retry via xas_nomem(), a concurrent t...