{"id":"UBUNTU-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":"2026-09-03T22:50:22.374474643Z","published":"2021-03-23T17:15:00Z","upstream":["CVE-2021-20219"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-20219"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2021/03/17/10"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2021/03/17/16"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-20219"}],"affected":[{"package":{"name":"linux-aws","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/linux-aws?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.0-1002.2","4.4.0-1003.3","4.4.0-1005.5","4.4.0-1006.6","4.4.0-1009.9","4.4.0-1010.10","4.4.0-1011.11","4.4.0-1012.12","4.4.0-1014.14","4.4.0-1016.16","4.4.0-1017.17","4.4.0-1019.19","4.4.0-1022.22","4.4.0-1023.23","4.4.0-1024.25","4.4.0-1025.26","4.4.0-1027.30","4.4.0-1028.31","4.4.0-1029.32","4.4.0-1031.34","4.4.0-1032.35","4.4.0-1034.37","4.4.0-1036.39","4.4.0-1037.40","4.4.0-1038.41","4.4.0-1039.42","4.4.0-1040.43","4.4.0-1042.45","4.4.0-1044.47","4.4.0-1045.48","4.4.0-1046.50","4.4.0-1048.52","4.4.0-1050.54","4.4.0-1052.56","4.4.0-1054.58","4.4.0-1055.59","4.4.0-1056.60","4.4.0-1058.62","4.4.0-1059.63","4.4.0-1060.64","4.4.0-1061.65","4.4.0-1062.66","4.4.0-1064.68","4.4.0-1065.69","4.4.0-1066.70","4.4.0-1067.71","4.4.0-1073.77","4.4.0-1074.78","4.4.0-1075.79","4.4.0-1076.80","4.4.0-1077.81","4.4.0-1078.82","4.4.0-1081.85","4.4.0-1082.86","4.4.0-1083.87","4.4.0-1085.89","4.4.0-1086.90","4.4.0-1087.91","4.4.0-1088.92","4.4.0-1090.94","4.4.0-1091.95","4.4.0-1092.96","4.4.0-1093.97","4.4.0-1094.99","4.4.0-1095.100","4.4.0-1096.101","4.4.0-1097.102","4.4.0-1098.103","4.4.0-1099.104","4.4.0-1101.106","4.4.0-1102.107","4.4.0-1103.108","4.4.0-1104.109","4.4.0-1107.113","4.4.0-1109.115","4.4.0-1110.116","4.4.0-1111.117","4.4.0-1112.118","4.4.0-1113.119","4.4.0-1114.120","4.4.0-1115.121","4.4.0-1116.122","4.4.0-1117.123","4.4.0-1118.124","4.4.0-1119.125","4.4.0-1120.126","4.4.0-1121.127","4.4.0-1122.128","4.4.0-1123.129","4.4.0-1124.130","4.4.0-1125.131","4.4.0-1127.133","4.4.0-1128.134","4.4.0-1129.135","4.4.0-1130.136","4.4.0-1131.137","4.4.0-1133.139","4.4.0-1134.140","4.4.0-1135.141","4.4.0-1136.142","4.4.0-1137.143","4.4.0-1138.144","4.4.0-1139.145","4.4.0-1140.146","4.4.0-1141.147","4.4.0-1142.148","4.4.0-1143.149","4.4.0-1144.150","4.4.0-1145.151","4.4.0-1146.152","4.4.0-1147.153","4.4.0-1148.154","4.4.0-1149.155","4.4.0-1150.156","4.4.0-1151.157","4.4.0-1152.158","4.4.0-1153.159","4.4.0-1154.160","4.4.0-1155.161","4.4.0-1156.162","4.4.0-1157.163","4.4.0-1158.164"],"ecosystem_specific":{"binaries":[{"binary_name":"linux-aws-cloud-tools-4.4.0-1158","binary_version":"4.4.0-1158.164"},{"binary_name":"linux-aws-headers-4.4.0-1158","binary_version":"4.4.0-1158.164"},{"binary_name":"linux-aws-tools-4.4.0-1158","binary_version":"4.4.0-1158.164"},{"binary_name":"linux-buildinfo-4.4.0-1158-aws","binary_version":"4.4.0-1158.164"},{"binary_name":"linux-cloud-tools-4.4.0-1158-aws","binary_version":"4.4.0-1158.164"},{"binary_name":"linux-headers-4.4.0-1158-aws","binary_version":"4.4.0-1158.164"},{"binary_name":"linux-image-4.4.0-1158-aws","binary_version":"4.4.0-1158.164"},{"binary_name":"linux-modules-4.4.0-1158-aws","binary_version":"4.4.0-1158.164"},{"binary_name":"linux-tools-4.4.0-1158-aws","binary_version":"4.4.0-1158.164"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20219.json"}},{"package":{"name":"linux-azure","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/linux-azure?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.15.0-1023.24~14.04.1","4.15.0-1030.31~14.04.1","4.15.0-1031.32~14.04.1","4.15.0-1032.33~14.04.2","4.15.0-1035.36~14.04.2","4.15.0-1036.38~14.04.2","4.15.0-1037.39~14.04.2","4.15.0-1039.41~14.04.2","4.15.0-1040.44~14.04.1","4.15.0-1041.45~14.04.1","4.15.0-1042.46~14.04.1","4.15.0-1045.49~14.04.1","4.15.0-1046.50~14.04.1","4.15.0-1047.51~14.04.1","4.15.0-1049.54~14.04.1","4.15.0-1050.55~14.04.1","4.15.0-1051.56~14.04.1","4.15.0-1052.57~14.04.1","4.15.0-1055.60~14.04.1","4.15.0-1056.61~14.04.1","4.15.0-1057.62~14.04.1","4.15.0-1059.64~14.04.1","4.15.0-1060.65~14.04.1","4.15.0-1061.66~14.04.1","4.15.0-1063.68~14.04.1","4.15.0-1064.69~14.04.1","4.15.0-1066.71~14.04.1","4.15.0-1067.72~14.04.1","4.15.0-1069.74~14.04.1","4.15.0-1071.76~14.04.1","4.15.0-1074.79~14.04.1","4.15.0-1077.82~14.04.1","4.15.0-1082.92~14.04.1","4.15.0-1083.93~14.04.1","4.15.0-1089.99~14.04.1","4.15.0-1091.101~14.04.1","4.15.0-1092.102~14.04.1","4.15.0-1093.103~14.04.1","4.15.0-1095.105~14.04.1","4.15.0-1096.106~14.04.1","4.15.0-1098.109~14.04.1","4.15.0-1100.111~14.04.1","4.15.0-1102.113~14.04.1","4.15.0-1103.114~14.04.1","4.15.0-1106.118~14.04.1","4.15.0-1108.120~14.04.1","4.15.0-1109.121~14.0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