{"id":"LSN-0083-1","summary":"Kernel Live Patch Security Notice","details":"The BPF subsystem in the Linux kernel before 4.17 mishandles\nsituations with a long jump over an instruction sequence where inner\ninstructions require substantial expansions into multiple BPF instructions,\nleading to an overflow. This affects kernel/bpf/core.c and\nnet/core/filter.c.(CVE-2018-25020)\n\nMaxim Levitsky discovered that the KVM hypervisor implementation for AMD\nprocessors in the Linux kernel did not properly prevent a guest VM from\nenabling AVIC in nested guest VMs. An attacker in a guest VM could use this\nto write to portions of the host's physical memory.(CVE-2021-3653)\n\nNadav Amit discovered that the hugetlb implementation in the Linux kernel\ndid not perform TLB flushes under certain conditions. A local attacker\ncould use this to leak or alter data from other processes that use huge\npages.(CVE-2021-4002)\n\nAndy Nguyen discovered that the netfilter subsystem in the Linux kernel\ncontained an out-of-bounds write in its setsockopt() implementation. A\nlocal attacker could use this to cause a denial of service (system crash)\nor possibly execute arbitrary code.(CVE-2021-22555)\n\nIt was discovered that the virtual file system implementation in the Linux\nkernel contained an unsigned to signed integer conversion error. A local\nattacker could use this to cause a denial of service (system crash) or\nexecute arbitrary code.(CVE-2021-33909)","modified":"2025-12-15T11:23:20.838364Z","published":"2022-01-06T08:48:25Z","upstream":["CVE-2018-25020","CVE-2021-22555","CVE-2021-33909","CVE-2021-3653","CVE-2021-4002","UBUNTU-CVE-2018-25020","UBUNTU-CVE-2021-22555","UBUNTU-CVE-2021-33909","UBUNTU-CVE-2021-3653","UBUNTU-CVE-2021-4002"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/LSN-0083-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-25020"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3653"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-4002"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-22555"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-33909"}],"affected":[{"package":{"name":"linux-aws","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/linux-aws@4.4.0-1134.148?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.0-1134.148"}]}],"versions":["4.4.0-1001.10","4.4.0-1003.12","4.4.0-1004.13","4.4.0-1007.16","4.4.0-1009.18","4.4.0-1011.20","4.4.0-1012.21","4.4.0-1013.22","4.4.0-1016.25","4.4.0-1017.26","4.4.0-1018.27","4.4.0-1020.29","4.4.0-1022.31","4.4.0-1026.35","4.4.0-1028.37","4.4.0-1030.39","4.4.0-1031.40","4.4.0-1032.41","4.4.0-1035.44","4.4.0-1037.46","4.4.0-1038.47","4.4.0-1039.48","4.4.0-1041.50","4.4.0-1043.52","4.4.0-1044.53","4.4.0-1047.56","4.4.0-1048.57","4.4.0-1049.58","4.4.0-1050.59","4.4.0-1052.61","4.4.0-1054.63","4.4.0-1055.64","4.4.0-1057.66","4.4.0-1060.69","4.4.0-1061.70","4.4.0-1062.71","4.4.0-1063.72","4.4.0-1065.75","4.4.0-1066.76","4.4.0-1067.77","4.4.0-1069.79","4.4.0-1070.80","4.4.0-1072.82","4.4.0-1073.83","4.4.0-1074.84","4.4.0-1075.85","4.4.0-1077.87","4.4.0-1079.89","4.4.0-1081.91","4.4.0-1083.93","4.4.0-1084.94","4.4.0-1085.96","4.4.0-1087.98","4.4.0-1088.99","4.4.0-1090.101","4.4.0-1092.103","4.4.0-1094.105","4.4.0-1095.106","4.4.0-1096.107","4.4.0-1098.109","4.4.0-1099.110","4.4.0-1100.111","4.4.0-1101.112","4.4.0-1102.113","4.4.0-1104.115","4.4.0-1105.116","4.4.0-1106.117","4.4.0-1107.118","4.4.0-1109.120","4.4.0-1110.121","4.4.0-1111.123","4.4.0-1112.124","4.4.0-1113.126","4.4.0-1114.127","4.4.0-1117.131","4.4.0-1118.132","4.4.0-1119.133","4.4.0-1121.135","4.4.0-1122.136","4.4.0-1123.137","4.4.0-1124.138","4.4.0-1126.140","4.4.0-1127.141","4.4.0-1128.142","4.4.0-1129.143","4.4.0-1130.144","4.4.0-1131.145","4.4.0-1132.146","4.4.0-1133.147"],"ecosystem_specific":{"module_version":"83","availability":"Livepatch 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