{"id":"CVE-2026-72418","revision":null,"records":[{"revision":"19878baa7a164487b9981ee3bedc8aa7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72418","aliases":[],"title":"netfilter: nf_conncount: prevent connlimit drops for early confirmed ct","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conncount: prevent connlimit drops for early confirmed ct\n\nCommit 69894e5b4c5e (\"netfilter: nft_connlimit: update the count if add\nwas skipped\") introduced a regression where packets for valid\nconnections are dropped when using connlimit for soft-limiting\nscenarios.\n\nThe issue occurs when a new connection reuses a socket currently in\nthe TIME_WAIT state. In this scenario, the connection tracking entry\nis evaluated as already confirmed. Previously, __nf_conncount_add()\nassumed that if a connection was confirmed and did not originate from\nthe loopback interface, it should skip the addition and return -EEXIST.\n\nSkipping the addition triggers a garbage collection run that cleans up\nthe TIME_WAIT connection. Consequently, the active connection count\ndrops to 0, which xt_connlimit mishandles, leading to the false rejection\nof the perfectly valid new connection.\n\nFix this by replacing the interface check with protocol-agnostic state\nchecks. We now skip the tree insertion and preserve the lockless garbage\ncollection optimization only if the connection is IPS_ASSURED. This\nallows early-confirmed setup packets (such as reused TIME_WAIT sockets\nor locally generated SYN-ACKs) to be properly evaluated and counted\nwithout falsely dropping. The goto check_connections path is maintained\nto ensure these setup packets are deduplicated correctly.\n\nThis has been tested with slowhttptest and HTTP server configured\nlocally to ensure we are not breaking soft-limiting scenarios for local\nor external connections. In addition, it was tested with a OVS zone\nlimit too.","state":0,"publishedAt":"2026-08-15T05:56:38.374+00:00","modifiedAt":"2026-10-16T18:55:22.66+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/netfilter/nf_conncount.c\"\n ],\n \"versions\": [\n {\n \"version\": \"460c112e1d887b58b06b56e8e0230058906ff2c3\",\n \"lessThan\": \"000ac6830b56499d6b65fd91486ce6689eb02be4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"53bc0ac47f4f7621c991807bc90e01df49561ac8\",\n \"lessThan\": \"cbe2d14a7c5b1fc71821fbfee5c4963917411e92\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ca8b4d1d6304a84ce2016fa2fe9a114b9607b839\",\n \"lessThan\": \"3793d24de224943e0a6016bbeffb6f5c4cea2e3d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8286c02fe9100330475331253fc590f047963f90\",\n \"lessThan\": \"abef7f817217fcb62c11821d6b895063eadb2828\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b29ddccf36946a90323486221f39e9f88cc01b8e\",\n \"lessThan\": \"ebfe8249ba79e4ff0f1e3aad8787b992ef27f026\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"77ea3d8ac3d3d59b5ac9ad639e4ba107c0f2ff1e\",\n \"lessThan\": \"329f2626ee5cb8fafdf6b58b624311529c57cb45\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"69894e5b4c5e28cda5f32af33d4a92b7a4b93b0e\",\n \"lessThan\": \"be52572c6d55f677ba76869d3c63805c0d4891a3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"69894e5b4c5e28cda5f32af33d4a92b7a4b93b0e\",\n \"lessThan\": \"c8b6f36f766991e3ebebec6596daee4b04dcbc49\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"f85623af16b83615e5f64a9b19ae1d584805cb07\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.10.248\",\n \"lessThan\": \"5.10.261\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.198\",\n \"lessThan\": \"5.15.212\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.160\",\n \"lessThan\": \"6.1.178\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.120\",\n \"lessThan\": \"6.6.145\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.63\",\n \"lessThan\": \"6.12.97\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.2\",\n \"lessThan\": \"6.18.40\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.17.13\",\n \"lessThan\": \"6.18\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/netfilter/nf_conncount.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.19\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.19\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.261\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.212\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/000ac6830b56499d6b65fd91486ce6689eb02be4","https://git.kernel.org/stable/c/cbe2d14a7c5b1fc71821fbfee5c4963917411e92","https://git.kernel.org/stable/c/3793d24de224943e0a6016bbeffb6f5c4cea2e3d","https://git.kernel.org/stable/c/abef7f817217fcb62c11821d6b895063eadb2828","https://git.kernel.org/stable/c/ebfe8249ba79e4ff0f1e3aad8787b992ef27f026","https://git.kernel.org/stable/c/329f2626ee5cb8fafdf6b58b624311529c57cb45","https://git.kernel.org/stable/c/be52572c6d55f677ba76869d3c63805c0d4891a3","https://git.kernel.org/stable/c/c8b6f36f766991e3ebebec6596daee4b04dcbc49"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72418","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72418","identifiers":["CVE-2026-72418"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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Not a global EPSS backfill.","generation":"2026-11-09T09:04:02.9162191+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T09:04:02.9162191+00:00","lastSuccessAt":"2026-11-09T09:04:03.197028+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:04:03.1970284+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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