{"id":"CVE-2019-20422","aliases":["EUVD-2019-10970","GHSA-mgr5-cghm-p294","UBUNTU-CVE-2019-20422"],"status":"published","title":"In the Linux kernel before 5.3.4, fib6_rule_lookup in net/ipv6/ip6_fib.c mishandles the...","description":"In the Linux kernel before 5.3.4, fib6_rule_lookup in net/ipv6/ip6_fib.c mishandles the RT6_LOOKUP_F_DST_NOREF flag in a reference-count decision, leading to (for example) a crash that was identified by syzkaller, aka CID-7b09c2d052db.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00434,"percentile":0.37923,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-755"],"published":"2020-01-27T04:21:55Z","modified":"2026-06-17T02:30:24Z","fixes":[{"ecosystem":"Ubuntu:18.04:LTS","package":"linux-hwe-edge","fixed_in":["5.3.0-22.24~18.04.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"linux-hwe-edge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.0-28.30~16.04.1","4.8.0-30.32~16.04.1","4.8.0-32.34~16.04.1","4.8.0-34.36~16.04.1","4.10.0-14.16~16.04.1","4.10.0-19.21~16.04.1","4.10.0-20.22~16.04.1","4.10.0-21.23~16.04.1","4.10.0-22.24~16.04.1","4.10.0-24.28~16.04.1","4.10.0-26.30~16.04.1","4.11.0-13.19~16.04.1","4.11.0-14.20~16.04.1","4.13.0-16.19~16.04.3","4.13.0-17.20~16.04.1","4.13.0-19.22~16.04.1","4.13.0-21.24~16.04.1","4.13.0-25.29~16.04.2","4.15.0-13.14~16.04.1","4.15.0-15.16~16.04.1","4.15.0-20.21~16.04.1","4.15.0-22.24~16.04.1","4.15.0-23.25~16.04.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-hwe-edge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.3.0-22.24~18.04.1"}]}],"versions":["5.0.0-15.16~18.04.1","5.0.0-16.17~18.04.1","5.0.0-17.18~18.04.1","5.0.0-19.20~18.04.1","5.0.0-20.21~18.04.1","5.3.0-19.20~18.04.2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-azure-edge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.18.0-1006.6~18.04.1","4.18.0-1007.7~18.04.1","4.18.0-1008.8~18.04.1","5.0.0-1012.12~18.04.2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-gcp-edge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.18.0-1004.5~18.04.1","4.18.0-1005.6~18.04.1","4.18.0-1006.7~18.04.1","4.18.0-1007.8~18.04.1","4.18.0-1008.9~18.04.1","4.18.0-1009.10~18.04.1","4.18.0-1011.12~18.04.1","4.18.0-1012.13~18.04.1","4.18.0-1013.14~18.04.1","4.18.0-1015.16~18.04.1","5.0.0-1011.11~18.04.1","5.0.0-1013.13~18.04.1"]},{"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-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"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List","Vendor Advisory","report"]},{"url":"https://github.com/torvalds/linux/commit/7b09c2d052db4b4ad0b27b97918b46a7746966fa","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","report"]},{"url":"https://security.netapp.com/advisory/ntap-20200313-0003/","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-20422"},{"url":"https://github.com/advisories/GHSA-mgr5-cghm-p294"},{"url":"https://ubuntu.com/security/CVE-2019-20422","tags":["report"]},{"url":"https://git.kernel.org/linus/7b09c2d052db4b4ad0b27b97918b46a7746966fa","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-20422","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2019-20422","description":"In the Linux kernel before 5.3.4, fib6_rule_lookup in net/ipv6/ip6_fib.c mishandles the RT6_LOOKUP_F_DST_NOREF flag in a reference-count decision, leading to (for example) a crash that was identified by syzkaller, aka CID-7b09c2d052db.","status":"published","published":"2020-01-27T04:21:55Z","modified":"2024-08-05T02:39:09.878Z","updated_at":"2026-11-02T14:20:17.722148Z"}],"euvd":[{"id":"EUVD-2019-10970","description":"In the Linux kernel before 5.3.4, fib6_rule_lookup in net/ipv6/ip6_fib.c mishandles the RT6_LOOKUP_F_DST_NOREF flag in a reference-count decision, leading to (for example) a crash that was identified by syzkaller, aka CID-7b09c2d052db.","status":"published","published":"2020-01-27T04:21:55Z","modified":"2024-08-05T02:39:09Z","updated_at":"2026-11-03T02:40:22.238276Z"}],"ghsa":[{"id":"GHSA-mgr5-cghm-p294","title":"In the Linux kernel before 5.3.4, fib6_rule_lookup in net/ipv6/ip6_fib.c mishandles the...","description":"In the Linux kernel before 5.3.4, fib6_rule_lookup in net/ipv6/ip6_fib.c mishandles the RT6_LOOKUP_F_DST_NOREF flag in a reference-count decision, leading to (for example) a crash that was identified by syzkaller, aka CID-7b09c2d052db.","status":"published","published":"2022-05-24T17:07:26Z","modified":"2023-01-29T05:01:23Z","updated_at":"2026-11-02T14:44:48.378382Z"}],"nvd":[{"id":"CVE-2019-20422","description":"In the Linux kernel before 5.3.4, fib6_rule_lookup in net/ipv6/ip6_fib.c mishandles the RT6_LOOKUP_F_DST_NOREF flag in a reference-count decision, leading to (for example) a crash that was identified by syzkaller, aka CID-7b09c2d052db.","status":"published","published":"2020-01-27T05:15:10.657Z","modified":"2026-06-17T02:30:24.343Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-755"],"updated_at":"2026-11-02T14:05:43.875329Z"}],"osv":[{"id":"UBUNTU-CVE-2019-20422","description":"In the Linux kernel before 5.3.4, fib6_rule_lookup in net/ipv6/ip6_fib.c mishandles the RT6_LOOKUP_F_DST_NOREF flag in a reference-count decision, leading to (for example) a crash that was identified by syzkaller, aka CID-7b09c2d052db.","status":"published","published":"2020-01-27T05:15:00Z","modified":"2025-10-24T04:48:08Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:21.213407Z"}]}}