{"id":"CVE-2026-31418","state":"PUBLISHED","title":"netfilter: ipset: drop logically empty buckets in mtype_del","description":"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->pos in k, but it only drops the\nbucket when both n->pos and k are zero. This misses buckets whose live\nentries have all been removed while n->pos still points past deleted slots.\n\nTreat a bucket as empty when all positions below n->pos are unused and\nrelease it directly instead of shrinking it further.","publishedAt":"2026-04-13T13:21:05.316Z","updatedAt":"2026-10-15T01:15:59.026Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"c098ff857e7ca923539164af5b3c2fe3e8f8afaf","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"58f3a14826d4e6b0d5421f1a64be280b48601ea2","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"6cea34d7ec6829b62f521a37a287f670144a2233","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"b7eef00f08b92b0b9efe8ae0df6d0005e6199323","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"ceacaa76f221a6577aba945bb8873c2e640aeba4","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"9862ef9ab0a116c6dca98842aab7de13a252ae02","versionType":"git"},{"version":"6c717726f341fd8f39a3ec2dcf5d98d9d28a2769","status":"affected","versionType":"git"},{"version":"d2997d64dfa65082236bca1efd596b6c935daf5e","status":"affected","versionType":"git"},{"version":"5.4.24","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.5.8","status":"affected","lessThan":"5.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipset/ip_set_hash_gen.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipset/ip_set_hash_gen.h"]}],"references":["https://git.kernel.org/stable/c/c098ff857e7ca923539164af5b3c2fe3e8f8afaf","https://git.kernel.org/stable/c/58f3a14826d4e6b0d5421f1a64be280b48601ea2","https://git.kernel.org/stable/c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb","https://git.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233","https://git.kernel.org/stable/c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323","https://git.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4","https://git.kernel.org/stable/c/ceacaa76f221a6577aba945bb8873c2e640aeba4","https://git.kernel.org/stable/c/9862ef9ab0a116c6dca98842aab7de13a252ae02","https://cert-portal.siemens.com/productcert/html/ssa-082556.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31418.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31418","state":"PUBLISHED","datePublished":"2026-04-13T13:21:05.316Z","dateUpdated":"2026-10-15T01:15:59.026Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.087Z"},"containers":{"cna":{"title":"netfilter: ipset: drop logically empty buckets in mtype_del","descriptions":[{"lang":"en","value":"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->pos in k, but it only drops the\nbucket when both n->pos and k are zero. This misses buckets whose live\nentries have all been removed while n->pos still points past deleted slots.\n\nTreat a bucket as empty when all positions below n->pos are unused and\nrelease it directly instead of shrinking it further."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"c098ff857e7ca923539164af5b3c2fe3e8f8afaf","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"58f3a14826d4e6b0d5421f1a64be280b48601ea2","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"6cea34d7ec6829b62f521a37a287f670144a2233","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"b7eef00f08b92b0b9efe8ae0df6d0005e6199323","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"ceacaa76f221a6577aba945bb8873c2e640aeba4","versionType":"git"},{"version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","status":"affected","lessThan":"9862ef9ab0a116c6dca98842aab7de13a252ae02","versionType":"git"},{"version":"6c717726f341fd8f39a3ec2dcf5d98d9d28a2769","status":"affected","versionType":"git"},{"version":"d2997d64dfa65082236bca1efd596b6c935daf5e","status":"affected","versionType":"git"},{"version":"5.4.24","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.5.8","status":"affected","lessThan":"5.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipset/ip_set_hash_gen.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipset/ip_set_hash_gen.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/c098ff857e7ca923539164af5b3c2fe3e8f8afaf"},{"url":"https://git.kernel.org/stable/c/58f3a14826d4e6b0d5421f1a64be280b48601ea2"},{"url":"https://git.kernel.org/stable/c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb"},{"url":"https://git.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233"},{"url":"https://git.kernel.org/stable/c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323"},{"url":"https://git.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4"},{"url":"https://git.kernel.org/stable/c/ceacaa76f221a6577aba945bb8873c2e640aeba4"},{"url":"https://git.kernel.org/stable/c/9862ef9ab0a116c6dca98842aab7de13a252ae02"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T16:04:57.387Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"7.0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5.8"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.5","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","defaultStatus":"unknown","versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}]}],"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}],"providerMetadata":{"shortName":"siemens-SADP","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","dateUpdated":"2026-10-15T01:15:59.026Z"},"x_adpType":"supplier"}]}}}