CVE-2025-21811
In the Linux kernel, the following vulnerability has been resolved: nilfs2: protect access to buffers with no active references nilfs_lookup_dirty_data_buffers(), which iterates through the buffers attached to dirty data folios/pages, accesses the…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.25%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: protect access to buffers with no active references nilfs_lookup_dirty_data_buffers(), which iterates through the buffers attached to dirty data folios/pages, accesses the attached buffers without locking the folios/pages. For data cache, nilfs_clear_folio_dirty() may be called asynchronously when the file system degenerates to read only, so nilfs_lookup_dirty_data_buffers() still has the potential to cause use after free issues when buffers lose the protection of their dirty state midway due to this asynchronous clearing and are unintentionally freed by try_to_free_buffers(). Eliminate this race issue by adjusting the lock section in this function.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.25% probability · 16th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/367a9bffabe08c04f6d725032cce3d891b2b9e1aPatch
- https://git.kernel.org/stable/c/4b08d23d7d1917bef4fbee8ad81372f49b006656Patch
- https://git.kernel.org/stable/c/58c27fa7a610b6e8d44e6220e7dbddfbaccaf439Patch
- https://git.kernel.org/stable/c/72cf688d0ce7e642b12ddc9b2a42524737ec1b4aPatch
- https://git.kernel.org/stable/c/8e1b9201c9a24638cf09c6e1c9f224157328010bPatch
- https://git.kernel.org/stable/c/c437dfac9f7a5a46ac2a5e6d6acd3059e9f68188Patch
- https://git.kernel.org/stable/c/d8ff250e085a4c4cdda4ad1cdd234ed110393143Patch
- https://git.kernel.org/stable/c/e1fc4a90a90ea8514246c45435662531975937d9Patch
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.