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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact total

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

No data.

References
Link Providers
https://git.kernel.org/stable/c/367a9bffabe08c04f6d725032cce3d891b2b9e1a cve-icon cve-icon
https://git.kernel.org/stable/c/4b08d23d7d1917bef4fbee8ad81372f49b006656 cve-icon cve-icon
https://git.kernel.org/stable/c/58c27fa7a610b6e8d44e6220e7dbddfbaccaf439 cve-icon cve-icon
https://git.kernel.org/stable/c/72cf688d0ce7e642b12ddc9b2a42524737ec1b4a cve-icon cve-icon
https://git.kernel.org/stable/c/8e1b9201c9a24638cf09c6e1c9f224157328010b cve-icon cve-icon
https://git.kernel.org/stable/c/c437dfac9f7a5a46ac2a5e6d6acd3059e9f68188 cve-icon cve-icon
https://git.kernel.org/stable/c/d8ff250e085a4c4cdda4ad1cdd234ed110393143 cve-icon cve-icon
https://git.kernel.org/stable/c/e1fc4a90a90ea8514246c45435662531975937d9 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025022754-CVE-2025-21811-beb7@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-21811 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-21811 cve-icon
History

Fri, 21 Mar 2025 19:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel

Thu, 13 Mar 2025 12:30:00 +0000

Type Values Removed Values Added
References

Tue, 04 Mar 2025 18:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Fri, 28 Feb 2025 14:45:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Thu, 27 Feb 2025 20:15:00 +0000

Type Values Removed Values Added
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.
Title nilfs2: protect access to buffers with no active references
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-02-27T20:01:02.256Z

Updated: 2025-03-24T15:40:46.135Z

Reserved: 2024-12-29T08:45:45.772Z

Link: CVE-2025-21811

cve-icon Vulnrichment

Updated: 2025-03-04T18:01:21.977Z

cve-icon NVD

Status : Analyzed

Published: 2025-02-27T20:16:03.680

Modified: 2025-03-21T18:30:54.380

Link: CVE-2025-21811

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-02-27T00:00:00Z

Links: CVE-2025-21811 - Bugzilla