Bug 2357137 (CVE-2025-22000)

Summary: CVE-2025-22000 kernel: mm/huge_memory: drop beyond-EOF folios with the right number of refs
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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OS: Linux   
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Description OSIDB Bzimport 2025-04-03 08:01:34 UTC 
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.
Comment 1 Avinash Hanwate 2025-04-03 09:35:57 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025040349-CVE-2025-22000-50c3@gregkh/T