CVE-2025-22000 Information

Description

In the Linux kernel the following vulnerability has been resolved:

mm/huge_memory: drop beyond-EOF folios with the right number of refs

When an after-split folio is large and needs to be dropped due to EOF folio_put_refs(folio folio_nr_pages(folio)) should be used to drop all page cache refs. Otherwise the folio will not be freed causing memory leak.

This leak would happen on a filesystem with blocksize > page_size and a truncate is performed where the blocksize makes folios split to >0 order ones causing truncated folios not being freed.

Reference

https://git.kernel.org/stable/c/14efb4793519d73fb2902bb0ece319b886e4b4b9 https://git.kernel.org/stable/c/86368616a9ce51f6b41efa251b6e066893851d67 https://git.kernel.org/stable/c/92ad820a1f2d95d5a8d6c2bd3f391bbb068a5f9e