CVE-2025-71295 - fs/buffer: add alert in try_to_free_buffers() for folios without buffers

CVE-2025-71295 - fs/buffer: add alert in try_to_free_buffers() for folios without buffers

https://cvefeed.io/rssfeed/latest.atom / Wed, 05/06/2026 - 14:22
CVE ID :CVE-2025-71295
Published : May 6, 2026, 11:32 a.m. | 44 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: fs/buffer: add alert in try_to_free_buffers() for folios without buffers try_to_free_buffers() can be called on folios with no buffers attached when filemap_release_folio() is invoked on a folio belonging to a mapping with AS_RELEASE_ALWAYS set but no release_folio operation defined. In such cases, folio_needs_release() returns true because of the AS_RELEASE_ALWAYS flag, but the folio has no private buffer data. This causes try_to_free_buffers() to call drop_buffers() on a folio with no buffers, leading to a null pointer dereference. Adding a check in try_to_free_buffers() to return early if the folio has no buffers attached, with WARN_ON_ONCE() to alert about the misconfiguration. This provides defensive hardening.
Severity: 0.0 | NA
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