{"id":"CVE-2021-20321","details":"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.","aliases":["A-222644279","PUB-A-222644279"],"modified":"2026-04-16T00:01:31.172253385Z","published":"2022-02-18T18:15:08.947Z","related":["ALSA-2021:5227","SUSE-SU-2022:1651-1","SUSE-SU-2022:1668-1","SUSE-SU-2022:1669-1","SUSE-SU-2022:1676-1","SUSE-SU-2022:1686-1","SUSE-SU-2022:1687-1","SUSE-SU-2022:2077-1","SUSE-SU-2022:2082-1","SUSE-SU-2022:2083-1","SUSE-SU-2022:2103-1","SUSE-SU-2022:2104-1","SUSE-SU-2022:2111-1"],"references":[{"type":"WEB","url":"https://lore.kernel.org/all/20211011134508.748956131%40linuxfoundation.org/"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html"},{"type":"ADVISORY","url":"https://www.debian.org/security/2022/dsa-5096"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2013242"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"5.15"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-NA"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc2"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc3"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc4"}]},{"events":[{"introduced":"0"},{"last_affected":"7.0"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"9.0"}]},{"events":[{"introduced":"0"},{"last_affected":"10.0"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-20321.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}