{"id":"CVE-2026-64564","revision":null,"records":[{"revision":"cfb83c455ca7425e8917f034bf09e1d3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64564","aliases":[],"title":"sctp: don't free the ASCONF's own transport in DEL-IP processing","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: don't free the ASCONF's own transport in DEL-IP processing\n\nsctp_process_asconf() caches the transport the ASCONF chunk is processed\nagainst in asconf->transport (== chunk->transport, set once in sctp_rcv()).\nFor an ASCONF located through its Address Parameter by\n__sctp_rcv_asconf_lookup(), that cached transport corresponds to the\nAddress Parameter, which need not be the packet's source address.\n\nsctp_process_asconf_param() rejects a DEL-IP for the packet source address\n(ADDIP D8, SCTP_ERROR_DEL_SRC_IP), but nothing protects asconf->transport.\nA single ASCONF can therefore carry, in order:\n\n [Address Parameter L] [DEL-IP L] [DEL-IP 0.0.0.0]\n\nwhere L differs from the source. The DEL-IP for L passes the D8 check and\ncalls sctp_assoc_rm_peer() on the transport that asconf->transport still\npoints at, freeing it (RCU-deferred). The following wildcard DEL-IP then\nreuses the now-dangling asconf->transport in sctp_assoc_set_primary() and\nsctp_assoc_del_nonprimary_peers(): set_primary() dereferences the freed\ntransport (->ipaddr, ->state) and plants the dangling pointer into\nasoc->peer.primary_path / active_path, and del_nonprimary_peers(), keeping\nonly the pointer that is no longer on the list, removes every real\ntransport, leaving the association with a transport_count of 0 and\nprimary_path/active_path pointing at freed memory.\n\nReject a DEL-IP that targets the transport the ASCONF is being processed\nagainst, mirroring the existing source-address guard, so the wildcard\nbranch can never reuse a freed transport.","state":0,"publishedAt":"2026-08-04T06:23:23.339+00:00","modifiedAt":"2026-10-19T20:48:42.076+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_make_chunk.c\"\n ],\n \"versions\": [\n {\n \"version\": \"42e30bf3463cd37d73839376662cb79b4d5c416c\",\n \"lessThan\": \"a9ce31be4cb1a5dd82b3e0a1d0c3e7cbdcd31293\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"42e30bf3463cd37d73839376662cb79b4d5c416c\",\n \"lessThan\": \"a63afa1f9b12d5293cbe0b77fd45dc0632533a13\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"42e30bf3463cd37d73839376662cb79b4d5c416c\",\n \"lessThan\": \"2b324ba3494ae958cba16a453e3e71489b4de7fc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"42e30bf3463cd37d73839376662cb79b4d5c416c\",\n \"lessThan\": \"fedeb4468987bcaff85fe3061de5ae052d414740\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"42e30bf3463cd37d73839376662cb79b4d5c416c\",\n \"lessThan\": \"74e8f3e7114f0e26d1b2c4c048044db9fcc27603\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"42e30bf3463cd37d73839376662cb79b4d5c416c\",\n \"lessThan\": \"85aca407c560aba81b5ce9d3d6cf94c74077d19b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"42e30bf3463cd37d73839376662cb79b4d5c416c\",\n \"lessThan\": \"d136b29bf91dd8e3161281b87de597b7311d9462\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"42e30bf3463cd37d73839376662cb79b4d5c416c\",\n \"lessThan\": \"9b2854f86f0b56e9027d68e7a3fc909d1a9b566f\",\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_make_chunk.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.25\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.25\",\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/a9ce31be4cb1a5dd82b3e0a1d0c3e7cbdcd31293","https://git.kernel.org/stable/c/a63afa1f9b12d5293cbe0b77fd45dc0632533a13","https://git.kernel.org/stable/c/2b324ba3494ae958cba16a453e3e71489b4de7fc","https://git.kernel.org/stable/c/fedeb4468987bcaff85fe3061de5ae052d414740","https://git.kernel.org/stable/c/74e8f3e7114f0e26d1b2c4c048044db9fcc27603","https://git.kernel.org/stable/c/85aca407c560aba81b5ce9d3d6cf94c74077d19b","https://git.kernel.org/stable/c/d136b29bf91dd8e3161281b87de597b7311d9462","https://git.kernel.org/stable/c/9b2854f86f0b56e9027d68e7a3fc909d1a9b566f","https://matrix.tencent.com/en/2026/08/06/sctphantom-CVE-2026-64564"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64564","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64564","identifiers":["CVE-2026-64564"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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