{"id":"CVE-2026-68300","revision":null,"records":[{"revision":"ac2d5ff322f54a3f8db2647d018550b1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-68300","aliases":[],"title":"sctp: auth: verify auth requirement when auth_chunk is NULL","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: auth: verify auth requirement when auth_chunk is NULL\n\nsctp_auth_chunk_verify() returns true unconditionally when\nchunk->auth_chunk is NULL, silently skipping authentication.\nThis is incorrect when:\n\n1. skb_clone() failed in the BH receive path, leaving auth_chunk\n NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new\n connections, so the early sctp_auth_recv_cid() check cannot\n catch this.\n\n2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never\n called and auth_chunk remains NULL.\n\nFix by checking sctp_auth_recv_cid() when auth_chunk is NULL:\nif authentication is required, return false to drop the chunk;\notherwise continue normally.","state":0,"publishedAt":"2026-08-10T12:02:34.168+00:00","modifiedAt":"2026-10-19T21:09:04.214+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/sctp/sm_statefuns.c\"\n ],\n \"versions\": [\n {\n \"version\": \"bbd0d59809f923ea2b540cbd781b32110e249f6e\",\n \"lessThan\": \"a129792b3aef15002746c13522781d92ed3522c3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bbd0d59809f923ea2b540cbd781b32110e249f6e\",\n \"lessThan\": \"5a022ac51ad83b4ce6c898f4b9eefc65bd26b247\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bbd0d59809f923ea2b540cbd781b32110e249f6e\",\n \"lessThan\": \"6caf0e8590c0bf05a76b0d387726adf3a6f3725c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bbd0d59809f923ea2b540cbd781b32110e249f6e\",\n \"lessThan\": \"ec2e157fc9678a9bc411305a25aec3fd337d7efb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bbd0d59809f923ea2b540cbd781b32110e249f6e\",\n \"lessThan\": \"28c5fdce9dd955d2baf5e28987819b6d7cfaf646\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bbd0d59809f923ea2b540cbd781b32110e249f6e\",\n \"lessThan\": \"18957373920caf5cdaf5cf32e5d1d7a99ca7700a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bbd0d59809f923ea2b540cbd781b32110e249f6e\",\n \"lessThan\": \"83f5031f2a6a49d696eb4cc0898345d12f9c6451\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bbd0d59809f923ea2b540cbd781b32110e249f6e\",\n \"lessThan\": \"8e04823c120b376ef7dab14b60ebf6823aa16c14\",\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/sctp/sm_statefuns.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.24\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.24\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.265\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.216\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.183\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.148\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.101\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.42\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.6\",\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:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/a129792b3aef15002746c13522781d92ed3522c3","https://git.kernel.org/stable/c/5a022ac51ad83b4ce6c898f4b9eefc65bd26b247","https://git.kernel.org/stable/c/6caf0e8590c0bf05a76b0d387726adf3a6f3725c","https://git.kernel.org/stable/c/ec2e157fc9678a9bc411305a25aec3fd337d7efb","https://git.kernel.org/stable/c/28c5fdce9dd955d2baf5e28987819b6d7cfaf646","https://git.kernel.org/stable/c/18957373920caf5cdaf5cf32e5d1d7a99ca7700a","https://git.kernel.org/stable/c/83f5031f2a6a49d696eb4cc0898345d12f9c6451","https://git.kernel.org/stable/c/8e04823c120b376ef7dab14b60ebf6823aa16c14"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68300","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-68300","identifiers":["CVE-2026-68300"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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