{"id":"CVE-2021-20219","details":"A denial of service vulnerability was found in n_tty_receive_char_special in drivers/tty/n_tty.c of the Linux kernel. In this flaw a local attacker with a normal user privilege could delay the loop (due to a changing ldata-\u003eread_head, and a missing sanity check) and cause a threat to the system availability.","modified":"2026-05-04T08:30:08.794056Z","published":"2021-03-23T17:15:13.607Z","withdrawn":"2026-05-04T08:30:08.794056Z","related":["SUSE-SU-2021:1210-1","SUSE-SU-2021:1248-1","SUSE-SU-2021:1266-1","SUSE-SU-2021:1573-1","SUSE-SU-2021:1596-1","SUSE-SU-2021:1617-1","SUSE-SU-2021:1623-1","SUSE-SU-2021:1624-1"],"references":[{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1923738"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"4.18"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-20219.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:N/I:N/A:H"}]}