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CVE PROGRAM SOURCE RECORDUnscored

CVE-2025-71295

fs/buffer: add alert in try_to_free_buffers() for folios without buffers

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • d0eafc763135508be118dac208887a26c0adb74d to < 1b111a69a6e33a922622bf9870e4e63fb2b649c8affected
  • b4fa966f03b7401ceacd4ffd7227197afb2b8376 to < c1b6227555c52781178132b7a06466711855795caffected
  • b4fa966f03b7401ceacd4ffd7227197afb2b8376 to < 727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3affected
  • b4fa966f03b7401ceacd4ffd7227197afb2b8376 to < 42c32d7571ccd8ef32351cac506f00b0fae99fd2affected
  • b4fa966f03b7401ceacd4ffd7227197afb2b8376 to < c6246ca15999053d2632fbcc7b86e6eef7f077cbaffected
  • b4fa966f03b7401ceacd4ffd7227197afb2b8376 to < b68f91ef3b3fe82ad78c417de71b675699a8467caffected
  • 6.1.72 to < 6.1.165affected

Linux Linux

Default version status: affected

  • 6.6affected
  • 0 to < 6.6unaffected
  • 6.1.165 to ≤ 6.1.*unaffected
  • 6.6.128 to ≤ 6.6.*unaffected
  • 6.12.75 to ≤ 6.12.*unaffected
  • 6.18.16 to ≤ 6.18.*unaffected
  • 6.19.6 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References