{"id":"CVE-2026-98223","published":"2026-10-06T09:18:09.290","lastModified":"2026-10-06T09:18:09.290","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm: filemap: retain mapped dropbehind folios\n\nFault-around can map ready dropbehind folios without going through the\nnormal page-cache lookup that clears dropbehind.  A mapping represents a\ncompeting cached user, so retain the folio instead of forcibly unmapping\nit when writeback completes.\n\nFor a mapped folio, folio_unmap_invalidate() can call\nunmap_mapping_folio(), which takes i_mmap_rwsem and may sleep.  Retaining\nmapped folios avoids this path when folio_end_dropbehind() runs in\nnon-preemptible task context.\n\nTal was able to trigger a sleeping-in-atomic warning due to this [1].\n\nUnmapped dropbehind folios continue through the existing invalidation path.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/2897601dffe576fcd87a4259102f41f7fb0cbfc8","tags":[]},{"url":"https://git.kernel.org/stable/c/77c0fade37c80e8aa16ac048a9828249055e3f66","tags":[]},{"url":"https://git.kernel.org/stable/c/848d2ce2fce15fbdc083fbf9691bfa72911033c4","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}