{"id":"CVE-2026-31418","summary":"netfilter: ipset: drop logically empty buckets in mtype_del","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: drop logically empty buckets in mtype_del\n\nmtype_del() counts empty slots below n-\u003epos in k, but it only drops the\nbucket when both n-\u003epos and k are zero. This misses buckets whose live\nentries have all been removed while n-\u003epos still points past deleted slots.\n\nTreat a bucket as empty when all positions below n-\u003epos are unused and\nrelease it directly instead of shrinking it further.","modified":"2026-11-07T02:30:27.347431812Z","published":"2026-04-13T13:21:05.316Z","related":["SUSE-SU-2026:23477-1","SUSE-SU-2026:23481-1","SUSE-SU-2026:23528-1","SUSE-SU-2026:23529-1","SUSE-SU-2026:23881-1","SUSE-SU-2026:23887-1","SUSE-SU-2026:23897-1","SUSE-SU-2026:23902-1","SUSE-SU-2026:4120-1","SUSE-SU-2026:4254-1","openSUSE-SU-2026:21910-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31418.json"},"references":[{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"},{"type":"WEB","url":"https://git.kernel.org/stable/c/58f3a14826d4e6b0d5421f1a64be280b48601ea2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9862ef9ab0a116c6dca98842aab7de13a252ae02"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c098ff857e7ca923539164af5b3c2fe3e8f8afaf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ceacaa76f221a6577aba945bb8873c2e640aeba4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31418.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31418"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66"},{"fixed":"c098ff857e7ca923539164af5b3c2fe3e8f8afaf"},{"fixed":"58f3a14826d4e6b0d5421f1a64be280b48601ea2"},{"fixed":"ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb"},{"fixed":"6cea34d7ec6829b62f521a37a287f670144a2233"},{"fixed":"b7eef00f08b92b0b9efe8ae0df6d0005e6199323"},{"fixed":"68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4"},{"fixed":"ceacaa76f221a6577aba945bb8873c2e640aeba4"},{"fixed":"9862ef9ab0a116c6dca98842aab7de13a252ae02"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.24"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.5.8"},{"fixed":"5.6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6c717726f341fd8f39a3ec2dcf5d98d9d28a2769"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d2997d64dfa65082236bca1efd596b6c935daf5e"}]}],"versions":["v5.4.302","v5.4.301","v5.4.300","v5.4.299","v5.4.298","v5.4.297","v5.4.296","v5.4.295","v5.4.294","v5.4.293","v5.4.292","v5.4.291","v5.4.290","v5.4.289","v5.4.288","v5.4.287","v5.4.286","v5.4.285","v5.4.284","v5.4.283","v5.4.282","v5.4.281","v5.4.280","v5.4.279","v5.4.278","v5.4.277","v5.4.276","v5.4.275","v5.4.274","v5.4.273","v5.4.272","v5.4.271","v5.4.270","v5.4.269","v5.4.268","v5.4.267","v5.4.266","v5.4.265","v5.4.264","v5.4.263","v5.4.262","v5.4.261","v5.4.260","v5.4.259","v5.4.258","v5.4.257","v5.4.256","v5.4.255","v5.4.254","v5.4.253","v5.4.252","v5.4.251","v5.4.250","v5.4.249","v5.4.248","v5.4.247","v5.4.246","v5.4.245","v5.4.244","v5.4.243","v5.4.242","v5.4.241","v5.4.240","v5.4.239","v5.4.238","v5.4.237","v5.4.236","v5.4.235","v5.4.234","v5.4.233","v5.4.232","v5.4.231","v5.4.230","v5.4.229","v5.4.228","v5.4.227","v5.4.226","v5.4.225","v5.4.224","v5.4.223","v5.4.222","v5.4.221","v5.4.220","v5.4.219","v5.4.218","v5.4.217","v5.4.216","v5.4.215","v5.4.214","v5.4.213","v5.4.212","v5.4.211","v5.4.210","v5.4.209","v5.4.208","v5.4.207","v5.4.206","v5.4.205","v5.4.204","v5.4.203","v5.4.202","v5.4.201","v5.4.200","v5.4.199","v5.4.198","v5.4.197","v5.4.196","v5.4.195","v5.4.194","v5.4.193","v5.4.192","v5.4.191","v5.4.190","v5.4.189","v5.4.188","v5.4.187","v5.4.186","v5.4.185","v5.4.184","v5.4.183","v5.4.182","v5.4.181","v5.4.180","v5.4.179","v5.4.178","v5.4.177","v5.4.176","v5.4.175","v5.4.174","v5.4.173","v5.4.172","v5.4.171","v5.4.170","v5.4.169","v5.4.168","v5.4.167","v5.4.166","v5.4.165","v5.4.164","v5.4.163","v5.4.162","v5.4.161","v5.4.160","v5.4.159","v5.4.158","v5.4.157","v5.4.156","v5.4.155","v5.4.154","v5.4.153","v5.4.152","v5.4.151","v5.4.150","v5.4.149","v5.4.148","v5.4.147","v5.4.146","v5.4.145","v5.4.144","v5.4.143","v5.4.142","v5.4.141","v5.4.140","v5.4.139","v5.4.138","v5.4.137","v5.4.136","v5.4.135","v5.4.134","v5.4.133","v5.4.132","v5.4.131","v5.4.130","v5.4.129","v5.4.128","v5.4.127","v5.4.12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