{"cve":"CVE-2025-21811","nvd":{"published":"2025-02-27T20:16:03.680","modified":"2026-06-17T08:44:20.057","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: protect access to buffers with no active references\n\nnilfs_lookup_dirty_data_buffers(), which iterates through the buffers\nattached to dirty data folios/pages, accesses the attached buffers without\nlocking the folios/pages.\n\nFor data cache, nilfs_clear_folio_dirty() may be called asynchronously\nwhen the file system degenerates to read only, so\nnilfs_lookup_dirty_data_buffers() still has the potential to cause use\nafter free issues when buffers lose the protection of their dirty state\nmidway due to this asynchronous clearing and are unintentionally freed by\ntry_to_free_buffers().\n\nEliminate this race issue by adjusting the lock section in this function.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["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"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2025-21811","score":0.00255,"percentile":0.17113,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}