Detections
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CVE-2026-31589
high
Description
In the Linux kernel, the following vulnerability has been resolved: mm: call ->free_folio() directly in folio_unmap_invalidate() We can only call filemap_free_folio() if we have a reference to (or hold a lock on) the mapping. Otherwise, we've already removed the folio from the mapping so it no longer pins the mapping and the mapping can be removed, causing a use-after-free when accessing mapping->a_ops. Follow the same pattern as __remove_mapping() and load the free_folio function pointer before dropping the lock on the mapping. That lets us make filemap_free_folio() static as this was the only caller outside filemap.c.
References
https://git.kernel.org/stable/c/c330e65ea59c4805d6ab6757c4ddfe8c63acef31
https://git.kernel.org/stable/c/b667df39d98a7a24be7c2a40ff0863dac1ad2cd7