{"id":"CVE-2026-23083","revision":null,"records":[{"revision":"9961de6207664116812b05b70cfd4015","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-23083","aliases":[],"title":"fou: Don't allow 0 for FOU_ATTR_IPPROTO.","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfou: Don't allow 0 for FOU_ATTR_IPPROTO.\n\nfou_udp_recv() has the same problem mentioned in the previous\npatch.\n\nIf FOU_ATTR_IPPROTO is set to 0, skb is not freed by\nfou_udp_recv() nor \"resubmit\"-ted in ip_protocol_deliver_rcu().\n\nLet's forbid 0 for FOU_ATTR_IPPROTO.","state":0,"publishedAt":"2026-02-04T16:08:07.561+00:00","modifiedAt":"2026-10-19T18:25:29.638+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 \"Documentation/netlink/specs/fou.yaml\",\n \"net/ipv4/fou_nl.c\"\n ],\n \"versions\": [\n {\n \"version\": \"23461551c00628c3f3fe9cf837bf53cf8f212b63\",\n \"lessThan\": \"c7498f9bc390479ccfad7c7f2332237ff4945b03\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23461551c00628c3f3fe9cf837bf53cf8f212b63\",\n \"lessThan\": \"611ef4bd9c73d9e6d87bed57a635ff1fdd8c91ea\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23461551c00628c3f3fe9cf837bf53cf8f212b63\",\n \"lessThan\": \"6e983789b7588ee59cbf303583546c043bad8e19\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23461551c00628c3f3fe9cf837bf53cf8f212b63\",\n \"lessThan\": \"1cc98b8887cabb1808d2f4a37cd10a7be7574771\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23461551c00628c3f3fe9cf837bf53cf8f212b63\",\n \"lessThan\": \"b7db31a52c3862a1a32202a273a4c32e7f5f4823\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23461551c00628c3f3fe9cf837bf53cf8f212b63\",\n \"lessThan\": \"9b75dff8446ec871030d8daf5a69e74f5fe8b956\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"23461551c00628c3f3fe9cf837bf53cf8f212b63\",\n \"lessThan\": \"7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5\",\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 \"Documentation/netlink/specs/fou.yaml\",\n \"net/ipv4/fou_nl.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.18\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.18\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.249\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.199\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.162\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.122\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.68\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.8\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/c7498f9bc390479ccfad7c7f2332237ff4945b03","https://git.kernel.org/stable/c/611ef4bd9c73d9e6d87bed57a635ff1fdd8c91ea","https://git.kernel.org/stable/c/6e983789b7588ee59cbf303583546c043bad8e19","https://git.kernel.org/stable/c/1cc98b8887cabb1808d2f4a37cd10a7be7574771","https://git.kernel.org/stable/c/b7db31a52c3862a1a32202a273a4c32e7f5f4823","https://git.kernel.org/stable/c/9b75dff8446ec871030d8daf5a69e74f5fe8b956","https://git.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23083","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-23083","identifiers":["CVE-2026-23083"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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