{"id":"CVE-2026-64564","summary":"sctp: don't free the ASCONF's own transport in DEL-IP processing","details":"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-\u003etransport (== chunk-\u003etransport, 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-\u003etransport.\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-\u003etransport still\npoints at, freeing it (RCU-deferred). The following wildcard DEL-IP then\nreuses the now-dangling asconf-\u003etransport in sctp_assoc_set_primary() and\nsctp_assoc_del_nonprimary_peers(): set_primary() dereferences the freed\ntransport (-\u003eipaddr, -\u003estate) and plants the dangling pointer into\nasoc-\u003epeer.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.","modified":"2026-10-05T13:26:55.634054518Z","published":"2026-08-04T06:23:23.339Z","related":["ALSA-2026:71016","ALSA-2026:71213","ALSA-2026:71232","ALSA-2026:71233","SUSE-SU-2026:23066-1","SUSE-SU-2026:23068-1","SUSE-SU-2026:23193-1","SUSE-SU-2026:23194-1","SUSE-SU-2026:23221-1","SUSE-SU-2026:23231-1","SUSE-SU-2026:23237-1","SUSE-SU-2026:23241-1","SUSE-SU-2026:23244-1","SUSE-SU-2026:23672-1","SUSE-SU-2026:23673-1","SUSE-SU-2026:23674-1","SUSE-SU-2026:23676-1","SUSE-SU-2026:23677-1","SUSE-SU-2026:23678-1","SUSE-SU-2026:23679-1","SUSE-SU-2026:23680-1","SUSE-SU-2026:23681-1","SUSE-SU-2026:23682-1","SUSE-SU-2026:23683-1","SUSE-SU-2026:23684-1","SUSE-SU-2026:23685-1","SUSE-SU-2026:23686-1","SUSE-SU-2026:23687-1","SUSE-SU-2026:23747-1","SUSE-SU-2026:23748-1","SUSE-SU-2026:23749-1","SUSE-SU-2026:23750-1","SUSE-SU-2026:23751-1","SUSE-SU-2026:23752-1","SUSE-SU-2026:23753-1","SUSE-SU-2026:23754-1","SUSE-SU-2026:23755-1","SUSE-SU-2026:23756-1","SUSE-SU-2026:23757-1","SUSE-SU-2026:23758-1","SUSE-SU-2026:23759-1","SUSE-SU-2026:23760-1","SUSE-SU-2026:23761-1","SUSE-SU-2026:23762-1","SUSE-SU-2026:23763-1","SUSE-SU-2026:23766-1","SUSE-SU-2026:23767-1","SUSE-SU-2026:23768-1","SUSE-SU-2026:23769-1","SUSE-SU-2026:23770-1","SUSE-SU-2026:23771-1","SUSE-SU-2026:23772-1","SUSE-SU-2026:23773-1","SUSE-SU-2026:23774-1","SUSE-SU-2026:23775-1","SUSE-SU-2026:23776-1","SUSE-SU-2026:23778-1","SUSE-SU-2026:23779-1","SUSE-SU-2026:23780-1","SUSE-SU-2026:23781-1","SUSE-SU-2026:23790-1","SUSE-SU-2026:23791-1","SUSE-SU-2026:23798-1","SUSE-SU-2026:23799-1","SUSE-SU-2026:23801-1","SUSE-SU-2026:23803-1","SUSE-SU-2026:23804-1","SUSE-SU-2026:23805-1","SUSE-SU-2026:23806-1","SUSE-SU-2026:23807-1","SUSE-SU-2026:23808-1","SUSE-SU-2026:23809-1","SUSE-SU-2026:23810-1","SUSE-SU-2026:23811-1","SUSE-SU-2026:23812-1","SUSE-SU-2026:23813-1","SUSE-SU-2026:23815-1","SUSE-SU-2026:23816-1","SUSE-SU-2026:23817-1","SUSE-SU-2026:23818-1","SUSE-SU-2026:23819-1","SUSE-SU-2026:23820-1","SUSE-SU-2026:23821-1","SUSE-SU-2026:23822-1","SUSE-SU-2026:23823-1","SUSE-SU-2026:23824-1","SUSE-SU-2026:23825-1","SUSE-SU-2026:23826-1","SUSE-SU-2026:23827-1","SUSE-SU-2026:23828-1","SUSE-SU-2026:23832-1","SUSE-SU-2026:23833-1","SUSE-SU-2026:23834-1","SUSE-SU-2026:23835-1","SUSE-SU-2026:23836-1","SUSE-SU-2026:23837-1","SUSE-SU-2026:23838-1","SUSE-SU-2026:23936-1","SUSE-SU-2026:23937-1","SUSE-SU-2026:23938-1","SUSE-SU-2026:23939-1","SUSE-SU-2026:23940-1","SUSE-SU-2026:23941-1","SUSE-SU-2026:23942-1","SUSE-SU-2026:23944-1","SUSE-SU-2026:23951-1","SUSE-SU-2026:23960-1","SUSE-SU-2026:23961-1","SUSE-SU-2026:23962-1","SUSE-SU-2026:23963-1","SUSE-SU-2026:23964-1","SUSE-SU-2026:23965-1","SUSE-SU-2026:23966-1","SUSE-SU-2026:23967-1","SUSE-SU-2026:23968-1","SUSE-SU-2026:3593-1","SUSE-SU-2026:3594-1","SUSE-SU-2026:3595-1","SUSE-SU-2026:3602-1","SUSE-SU-2026:3616-1","SUSE-SU-2026:3617-1","SUSE-SU-2026:3790-1","SUSE-SU-2026:3809-1","SUSE-SU-2026:3810-1","SUSE-SU-2026:4170-1","SUSE-SU-2026:4172-1","SUSE-SU-2026:4231-1","SUSE-SU-2026:4244-1","SUSE-SU-2026:4255-1","SUSE-SU-2026:4256-1","SUSE-SU-2026:4258-1","SUSE-SU-2026:4259-1","SUSE-SU-2026:4310-1","SUSE-SU-2026:4315-1","SUSE-SU-2026:4356-1","SUSE-SU-2026:4357-1","SUSE-SU-2026:4359-1","SUSE-SU-2026:4383-1","openSUSE-SU-2026:11476-1","openSUSE-SU-2026:21555-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64564.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/08/06/13"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/08/06/3"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/08/06/4"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/08/07/1"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/08/07/2"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/08/07/8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2b324ba3494ae958cba16a453e3e71489b4de7fc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/74e8f3e7114f0e26d1b2c4c048044db9fcc27603"},{"type":"WEB","url":"https://git.kernel.org/stable/c/85aca407c560aba81b5ce9d3d6cf94c74077d19b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9b2854f86f0b56e9027d68e7a3fc909d1a9b566f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a63afa1f9b12d5293cbe0b77fd45dc0632533a13"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9ce31be4cb1a5dd82b3e0a1d0c3e7cbdcd31293"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d136b29bf91dd8e3161281b87de597b7311d9462"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fedeb4468987bcaff85fe3061de5ae052d414740"},{"type":"WEB","url":"https://matrix.tencent.com/en/2026/08/06/sctphantom-CVE-2026-64564"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64564.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64564"},{"type":"PACKAGE"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