{"id":"CVE-2021-4090","details":"An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.","modified":"2026-03-14T11:10:54.932563Z","published":"2022-02-18T18:15:10.207Z","references":[{"type":"WEB","url":"https://lore.kernel.org/linux-nfs/163692036074.16710.5678362976688977923.stgit%40klimt.1015granger.net/"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20220318-0010/"},{"type":"FIX","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2025101"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"5.16"}]},{"events":[{"introduced":"0"},{"last_affected":"5.16-NA"}]},{"events":[{"introduced":"0"},{"last_affected":"5.16-rc1"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4090.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}