{"id":"CVE-2025-40183","revision":null,"records":[{"revision":"a8d1bdec3f694685ad3b1c220b3aeb9b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-40183","aliases":[],"title":"bpf: Fix metadata_dst leak __bpf_redirect_neigh_v{4,6}","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix metadata_dst leak __bpf_redirect_neigh_v{4,6}\n\nCilium has a BPF egress gateway feature which forces outgoing K8s Pod\ntraffic to pass through dedicated egress gateways which then SNAT the\ntraffic in order to interact with stable IPs outside the cluster.\n\nThe traffic is directed to the gateway via vxlan tunnel in collect md\nmode. A recent BPF change utilized the bpf_redirect_neigh() helper to\nforward packets after the arrival and decap on vxlan, which turned out\nover time that the kmalloc-256 slab usage in kernel was ever-increasing.\n\nThe issue was that vxlan allocates the metadata_dst object and attaches\nit through a fake dst entry to the skb. The latter was never released\nthough given bpf_redirect_neigh() was merely setting the new dst entry\nvia skb_dst_set() without dropping an existing one first.","state":0,"publishedAt":"2025-11-12T21:56:27.429+00:00","modifiedAt":"2026-10-15T22:02:39.85+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/core/filter.c\"\n ],\n \"versions\": [\n {\n \"version\": \"b4ab31414970a7a03a5d55d75083f2c101a30592\",\n \"lessThan\": \"3fba965a9aac0fa3cbd8138436a37af9ab466d79\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b4ab31414970a7a03a5d55d75083f2c101a30592\",\n \"lessThan\": \"057764172fcc6ee2ccb6c41351a55a9f054dc8fd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b4ab31414970a7a03a5d55d75083f2c101a30592\",\n \"lessThan\": \"2e67c2037382abb56497bb9d7b7e10be04eb5598\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b4ab31414970a7a03a5d55d75083f2c101a30592\",\n \"lessThan\": \"b6bfe44b6dbb14a31d86c475cdc9c7689534fb09\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b4ab31414970a7a03a5d55d75083f2c101a30592\",\n \"lessThan\": \"f36a305d30f557306d87c787ddffe094ac5dac89\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b4ab31414970a7a03a5d55d75083f2c101a30592\",\n \"lessThan\": \"7404ce888a45eb7da0508b7cbbe6f2e95302eeb8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b4ab31414970a7a03a5d55d75083f2c101a30592\",\n \"lessThan\": \"23f3770e1a53e6c7a553135011f547209e141e72\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\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/core/filter.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.10\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.10\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.246\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.195\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.157\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.113\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.54\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.17.4\",\n \"lessThanOrEqual\": \"6.17.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18\",\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/3fba965a9aac0fa3cbd8138436a37af9ab466d79","https://git.kernel.org/stable/c/057764172fcc6ee2ccb6c41351a55a9f054dc8fd","https://git.kernel.org/stable/c/2e67c2037382abb56497bb9d7b7e10be04eb5598","https://git.kernel.org/stable/c/b6bfe44b6dbb14a31d86c475cdc9c7689534fb09","https://git.kernel.org/stable/c/f36a305d30f557306d87c787ddffe094ac5dac89","https://git.kernel.org/stable/c/7404ce888a45eb7da0508b7cbbe6f2e95302eeb8","https://git.kernel.org/stable/c/23f3770e1a53e6c7a553135011f547209e141e72"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-40183","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-40183","identifiers":["CVE-2025-40183"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-469e0902b40147e98a6498cf72d41be8","complete":true,"records":13655,"lastAttemptAt":"2026-11-09T12:14:17.3321495+00:00","lastSuccessAt":"2026-11-09T12:14:17.327+00:00","error":null,"lastVerifiedAt":"2026-11-09T12:14:17.327+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13707,"expectedIdentifiers":13707,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T12:02:21.9910047+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T12:02:21.9910047+00:00","lastSuccessAt":"2026-11-09T12:02:22.1781502+00:00","error":null,"lastVerifiedAt":"2026-11-09T12:02:22.1781508+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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