{"api_version":"1","generated_at":"2026-04-19T01:10:19+00:00","cve":"CVE-2026-31418","urls":{"html":"https://cve.report/CVE-2026-31418","api":"https://cve.report/api/cve/CVE-2026-31418.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31418","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31418"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-13 14:16:11","updated_at":"2026-04-18 09:16:31"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323","name":"https://git.kernel.org/stable/c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/58f3a14826d4e6b0d5421f1a64be280b48601ea2","name":"https://git.kernel.org/stable/c/58f3a14826d4e6b0d5421f1a64be280b48601ea2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233","name":"https://git.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9862ef9ab0a116c6dca98842aab7de13a252ae02","name":"https://git.kernel.org/stable/c/9862ef9ab0a116c6dca98842aab7de13a252ae02","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ceacaa76f221a6577aba945bb8873c2e640aeba4","name":"https://git.kernel.org/stable/c/ceacaa76f221a6577aba945bb8873c2e640aeba4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4","name":"https://git.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c098ff857e7ca923539164af5b3c2fe3e8f8afaf","name":"https://git.kernel.org/stable/c/c098ff857e7ca923539164af5b3c2fe3e8f8afaf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb","name":"https://git.kernel.org/stable/c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31418","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31418","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 c098ff857e7ca923539164af5b3c2fe3e8f8afaf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 58f3a14826d4e6b0d5421f1a64be280b48601ea2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 6cea34d7ec6829b62f521a37a287f670144a2233 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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00:10:43"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/ipset/ip_set_hash_gen.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"c098ff857e7ca923539164af5b3c2fe3e8f8afaf","status":"affected","version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","versionType":"git"},{"lessThan":"58f3a14826d4e6b0d5421f1a64be280b48601ea2","status":"affected","version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","versionType":"git"},{"lessThan":"ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb","status":"affected","version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","versionType":"git"},{"lessThan":"6cea34d7ec6829b62f521a37a287f670144a2233","status":"affected","version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","versionType":"git"},{"lessThan":"b7eef00f08b92b0b9efe8ae0df6d0005e6199323","status":"affected","version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","versionType":"git"},{"lessThan":"68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4","status":"affected","version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","versionType":"git"},{"lessThan":"ceacaa76f221a6577aba945bb8873c2e640aeba4","status":"affected","version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","versionType":"git"},{"lessThan":"9862ef9ab0a116c6dca98842aab7de13a252ae02","status":"affected","version":"8af1c6fbd9239877998c7f5a591cb2c88d41fb66","versionType":"git"},{"status":"affected","version":"6c717726f341fd8f39a3ec2dcf5d98d9d28a2769","versionType":"git"},{"status":"affected","version":"d2997d64dfa65082236bca1efd596b6c935daf5e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/ipset/ip_set_hash_gen.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.6"},{"lessThan":"5.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.168","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.134","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.81","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.22","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.168","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.134","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.81","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.22","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.12","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"5.6","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","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-04-18T08:59:32.191Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"netfilter: ipset: drop logically empty buckets in mtype_del","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31418","datePublished":"2026-04-13T13:21:05.316Z","dateReserved":"2026-03-09T15:48:24.087Z","dateUpdated":"2026-04-18T08:59:32.191Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-13 14:16:11","lastModifiedDate":"2026-04-18 09:16:31","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31418","Ordinal":"1","Title":"netfilter: ipset: drop logically empty buckets in mtype_del","CVE":"CVE-2026-31418","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31418","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"netfilter: ipset: drop logically empty buckets in mtype_del"}]}}}