{"id":"CVE-2019-18198","aliases":["EUVD-2019-8000","GHSA-3wc6-3hc2-3wc8","UBUNTU-CVE-2019-18198"],"status":"published","title":"In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress()...","description":"In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c, when handling the FIB_LOOKUP_NOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00472,"percentile":0.41127,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-772"],"published":"2019-10-17T00:00:00Z","modified":"2026-06-17T02:24:27Z","affected":[{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"linux-azure-fde","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.4.0-1063.66+cvm2.2","5.4.0-1063.66+cvm3.2","5.4.0-1064.67+cvm1.1","5.4.0-1065.68+cvm2.1","5.4.0-1067.70+cvm1.1","5.4.0-1068.71+cvm1.1","5.4.0-1069.72+cvm1.1","5.4.0-1070.73+cvm1.1","5.4.0-1072.75+cvm1.1","5.4.0-1073.76+cvm1.1","5.4.0-1074.77+cvm1.1","5.4.0-1076.79+cvm1.1","5.4.0-1078.81+cvm1.1","5.4.0-1080.83+cvm1.1","5.4.0-1083.87+cvm1.1","5.4.0-1085.90+cvm1.1","5.4.0-1085.90+cvm2.1","5.4.0-1086.91+cvm1.1","5.4.0-1089.94+cvm1.2","5.4.0-1090.95+cvm1.1","5.4.0-1091.96+cvm1.1","5.4.0-1092.97+cvm1.1","5.4.0-1095.101+cvm1.1","5.4.0-1098.104+cvm1.1","5.4.0-1100.106+cvm1.1","5.4.0-1103.109+cvm1.1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"linux-gke","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.4.0-1033.35","5.4.0-1035.37","5.4.0-1036.38","5.4.0-1037.39","5.4.0-1039.41","5.4.0-1041.43","5.4.0-1042.44","5.4.0-1043.45","5.4.0-1044.46","5.4.0-1046.48","5.4.0-1049.52","5.4.0-1051.54","5.4.0-1052.55","5.4.0-1053.56","5.4.0-1054.57","5.4.0-1055.58","5.4.0-1056.59","5.4.0-1057.60","5.4.0-1059.62","5.4.0-1061.64","5.4.0-1062.65","5.4.0-1063.66","5.4.0-1065.68","5.4.0-1066.69","5.4.0-1067.70","5.4.0-1068.71","5.4.0-1071.76","5.4.0-1072.77","5.4.0-1074.79","5.4.0-1076.82","5.4.0-1078.84","5.4.0-1080.86","5.4.0-1081.87","5.4.0-1083.89","5.4.0-1084.90","5.4.0-1086.93","5.4.0-1087.94","5.4.0-1090.97","5.4.0-1091.98","5.4.0-1094.101","5.4.0-1095.102","5.4.0-1096.103","5.4.0-1097.104","5.4.0-1098.105","5.4.0-1099.106","5.4.0-1100.107","5.4.0-1101.108","5.4.0-1102.109","5.4.0-1103.110","5.4.0-1104.111","5.4.0-1105.112"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"linux-gkeop","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.4.0-1008.9","5.4.0-1009.10","5.4.0-1010.11","5.4.0-1011.12","5.4.0-1012.13","5.4.0-1013.14","5.4.0-1014.15","5.4.0-1015.16","5.4.0-1016.17","5.4.0-1018.19","5.4.0-1021.22","5.4.0-1022.23","5.4.0-1023.24","5.4.0-1024.25","5.4.0-1025.26","5.4.0-1026.27","5.4.0-1027.28","5.4.0-1029.30","5.4.0-1031.32","5.4.0-1032.33","5.4.0-1033.34","5.4.0-1034.35","5.4.0-1036.37","5.4.0-1037.38","5.4.0-1038.39","5.4.0-1039.40","5.4.0-1040.41","5.4.0-1043.44","5.4.0-1046.48","5.4.0-1048.51","5.4.0-1049.52","5.4.0-1051.54","5.4.0-1052.55","5.4.0-1053.56","5.4.0-1054.57","5.4.0-1056.60","5.4.0-1057.61","5.4.0-1060.64","5.4.0-1061.65","5.4.0-1062.66","5.4.0-1064.68","5.4.0-1065.69","5.4.0-1066.70","5.4.0-1067.71","5.4.0-1068.72","5.4.0-1069.73","5.4.0-1070.74","5.4.0-1071.75","5.4.0-1072.76","5.4.0-1073.77","5.4.0-1074.78","5.4.0-1075.79","5.4.0-1076.80","5.4.0-1077.81","5.4.0-1078.82","5.4.0-1079.83","5.4.0-1080.84","5.4.0-1081.85","5.4.0-1083.87","5.4.0-1084.88","5.4.0-1085.89","5.4.0-1086.90","5.4.0-1087.91","5.4.0-1088.92","5.4.0-1089.93","5.4.0-1090.94","5.4.0-1091.95","5.4.0-1092.96","5.4.0-1093.97","5.4.0-1094.98","5.4.0-1095.99","5.4.0-1096.100","5.4.0-1097.101","5.4.0-1098.102","5.4.0-1099.103","5.4.0-1100.104","5.4.0-1101.105","5.4.0-1102.106"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"linux-gkeop-5.15","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.15.0-1003.5~20.04.2","5.15.0-1005.7~20.04.1","5.15.0-1007.10~20.04.1","5.15.0-1008.12~20.04.1","5.15.0-1011.15~20.04.2","5.15.0-1012.16~20.04.1","5.15.0-1013.17~20.04.1","5.15.0-1015.19~20.04.1","5.15.0-1016.21~20.04.1","5.15.0-1017.22~20.04.1","5.15.0-1018.23~20.04.1","5.15.0-1019.24~20.04.1","5.15.0-1020.25~20.04.1","5.15.0-1021.26~20.04.1","5.15.0-1022.27~20.04.1","5.15.0-1023.28~20.04.1","5.15.0-1024.29~20.04.1","5.15.0-1025.30~20.04.1","5.15.0-1026.31~20.04.1","5.15.0-1027.32~20.04.1","5.15.0-1028.33~20.04.1","5.15.0-1030.35~20.04.1","5.15.0-1031.37~20.04.1","5.15.0-1032.38~20.04.1","5.15.0-1033.39~20.04.1","5.15.0-1034.40~20.04.1","5.15.0-1035.41~20.04.1","5.15.0-1036.42~20.04.1","5.15.0-1037.43~20.04.1","5.15.0-1038.44~20.04.1","5.15.0-1039.45~20.04.1","5.15.0-1040.46~20.04.1","5.15.0-1043.50~20.04.1","5.15.0-1044.51~20.04.1","5.15.0-1045.52~20.04.1","5.15.0-1046.53~20.04.1","5.15.0-1047.54~20.04.1","5.15.0-1048.55~20.04.1","5.15.0-1049.56~20.04.1","5.15.0-1050.57~20.04.1","5.15.0-1051.58~20.04.1","5.15.0-1052.59~20.04.1","5.15.0-1053.60~20.04.1","5.15.0-1054.61~20.04.1","5.15.0-1055.62~20.04.1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"linux-raspi2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.3.0-1007.8","5.3.0-1014.16","5.3.0-1015.17","5.3.0-1017.19","5.4.0-1004.4","5.4.0-1006.6"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"linux-riscv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.4.0-24.28","5.4.0-26.30","5.4.0-27.31","5.4.0-28.32","5.4.0-30.34","5.4.0-31.35","5.4.0-33.37","5.4.0-34.38","5.4.0-36.41","5.4.0-37.42","5.4.0-39.44","5.4.0-40.45"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"linux-intel-iot-realtime","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.15.0-1073.75"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"linux-realtime","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.15.0-1032.35"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"linux-riscv","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.13.0-1004.4","5.13.0-1006.6+22.04.1","5.13.0-1007.7+22.04.1","5.13.0-1010.11+22.04.1","5.15.0-1004.4","5.15.0-1005.5","5.15.0-1006.6","5.15.0-1007.7","5.15.0-1008.8","5.15.0-1011.12","5.15.0-1012.13","5.15.0-1014.16","5.15.0-1015.17","5.15.0-1016.18","5.15.0-1017.19","5.15.0-1018.21","5.15.0-1019.22","5.15.0-1020.23","5.15.0-1022.26","5.15.0-1023.27","5.15.0-1026.30","5.15.0-1027.31","5.15.0-1028.32"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"linux-raspi-realtime","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.8.0-2019.20"]}],"products":[{"vendor":"canonical","product":"ubuntu_linux"},{"vendor":"linux","product":"linux_kernel"}],"references":[{"url":"https://github.com/torvalds/linux/commit/ca7a03c4175366a92cee0ccc4fec0038c3266e26","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory"]},{"url":"https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca7a03c4175366a92cee0ccc4fec0038c3266e26","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory","report"]},{"url":"https://launchpad.net/bugs/1847478","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory"]},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.4","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory"]},{"url":"https://usn.ubuntu.com/4161-1/","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred","Third Party Advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20191031-0005/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-18198"},{"url":"https://github.com/advisories/GHSA-3wc6-3hc2-3wc8"},{"url":"https://ubuntu.com/security/CVE-2019-18198","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4161-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-18198","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2019-18198","description":"In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c, when handling the FIB_LOOKUP_NOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753.","status":"published","published":"2019-10-18T21:07:19Z","modified":"2024-08-05T01:47:13.524Z","updated_at":"2026-11-02T14:32:23.803059Z"}],"euvd":[{"id":"EUVD-2019-8000","description":"In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c, when handling the FIB_LOOKUP_NOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753.","status":"published","published":"2019-10-18T21:07:19Z","modified":"2024-08-05T01:47:13Z","updated_at":"2026-11-03T02:40:28.860423Z"}],"ghsa":[{"id":"GHSA-3wc6-3hc2-3wc8","title":"In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress()...","description":"In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c, when handling the FIB_LOOKUP_NOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753.","status":"published","published":"2022-05-24T16:59:30Z","modified":"2023-01-20T21:30:34Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T14:41:42.013329Z"}],"nvd":[{"id":"CVE-2019-18198","description":"In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c, when handling the FIB_LOOKUP_NOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753.","status":"published","published":"2019-10-18T22:15:14.767Z","modified":"2026-06-17T02:24:27.63Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.2,"vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T14:05:31.860711Z"}],"osv":[{"id":"UBUNTU-CVE-2019-18198","description":"In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c, when handling the FIB_LOOKUP_NOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753.","status":"published","published":"2019-10-17T00:00:00Z","modified":"2026-02-04T04:25:18.04346Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:20.325378Z"}]}}