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 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.

The following products are affected by CVE-2025-21811 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-21811.

URL	Resource
https://git.kernel.org/stable/c/367a9bffabe08c04f6d725032cce3d891b2b9e1a
https://git.kernel.org/stable/c/4b08d23d7d1917bef4fbee8ad81372f49b006656
https://git.kernel.org/stable/c/58c27fa7a610b6e8d44e6220e7dbddfbaccaf439
https://git.kernel.org/stable/c/72cf688d0ce7e642b12ddc9b2a42524737ec1b4a
https://git.kernel.org/stable/c/8e1b9201c9a24638cf09c6e1c9f224157328010b
https://git.kernel.org/stable/c/c437dfac9f7a5a46ac2a5e6d6acd3059e9f68188
https://git.kernel.org/stable/c/d8ff250e085a4c4cdda4ad1cdd234ed110393143
https://git.kernel.org/stable/c/e1fc4a90a90ea8514246c45435662531975937d9
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
https://lore.kernel.org/linux-cve-announce/2025022754-CVE-2025-21811-beb7@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-21811
https://www.cve.org/CVERecord?id=CVE-2025-21811