Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d0eafc763135508be118dac208887a26c0adb74d before 1b111a69a6e33a922622bf9870e4e63fb2b649c8; affected b4fa966f03b7401ceacd4ffd7227197afb2b8376 before c1b6227555c52781178132b7a06466711855795c; affected b4fa966f03b7401ceacd4ffd7227197afb2b8376 before 727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3; affected b4fa966f03b7401ceacd4ffd7227197afb2b8376 before 42c32d7571ccd8ef32351cac506f00b0fae99fd2; affected b4fa966f03b7401ceacd4ffd7227197afb2b8376 before c6246ca15999053d2632fbcc7b86e6eef7f077cb; affected b4fa966f03b7401ceacd4ffd7227197afb2b8376 before b68f91ef3b3fe82ad78c417de71b675699a8467c; affected 6.1.72 before 6.1.165 |
| Linux / Linux | affected 6.6; unaffected 0 before 6.6; unaffected 6.1.165 through 6.1.*; unaffected 6.6.128 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.16 through 6.18.*; unaffected 6.19.6 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/1b111a69a6e33a922622bf9870e4e63fb2b649c8
- https://git.kernel.org/stable/c/c1b6227555c52781178132b7a06466711855795c
- https://git.kernel.org/stable/c/727e5140e0cf83b4ce6a11b89bb73bff5d96f8f3
- https://git.kernel.org/stable/c/42c32d7571ccd8ef32351cac506f00b0fae99fd2
- https://git.kernel.org/stable/c/c6246ca15999053d2632fbcc7b86e6eef7f077cb
- https://git.kernel.org/stable/c/b68f91ef3b3fe82ad78c417de71b675699a8467c