{"cve":"CVE-2021-20321","nvd":{"published":"2022-02-18T18:15:08.947","modified":"2026-06-17T03:33:40.157","status":"Modified","description":"A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","score":4.7},"cwes":["CWE-362"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=2013242","https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html","https://lore.kernel.org/all/20211011134508.748956131%40linuxfoundation.org/","https://www.debian.org/security/2022/dsa-5096","https://bugzilla.redhat.com/show_bug.cgi?id=2013242"],"products":["debian:debian_linux","linux:linux_kernel","redhat:enterprise_linux"],"source":"nvd","synced_at":"2026-10-19T21:28:04.509275555+00:00"},"epss":{"cve":"CVE-2021-20321","score":0.00216,"percentile":0.12046,"date":"2026-11-01"},"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."]}