{"id":"CVE-2026-68320","summary":"sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid\n\nsctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the\ncapacity limit for ep-\u003eauth_chunk_list, allowing it to hold up to\n20 chunk entries (param_hdr.length up to 24). However, the copy\ndestination asoc-\u003ec.auth_chunks in struct sctp_cookie is only\nSCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16\nchunks are added, sctp_association_init() memcpy overflows the\ndestination by up to 4 bytes.\n\nFix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching\nthe destination capacity.","modified":"2026-08-12T04:18:47.855554079Z","published":"2026-08-10T12:02:55.144Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68320.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/11092d79eb2b7c0068382f72fc2416d1786bb2e0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5a365f1e423444c5da7eb689a8661633dad43e48"},{"type":"WEB","url":"https://git.kernel.org/stable/c/886e28e14ab655012779016d251fef53d103aa12"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b6ea3dda09eb4d5caf7bbc00f857688cf9e98255"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ff04b26794a16a8a879eb4fd2c02c2d6b03850e9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68320.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68320"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1f485649f52929d9937b346a920a522a7363e202"},{"fixed":"5a365f1e423444c5da7eb689a8661633dad43e48"},{"fixed":"886e28e14ab655012779016d251fef53d103aa12"},{"fixed":"11092d79eb2b7c0068382f72fc2416d1786bb2e0"},{"fixed":"b6ea3dda09eb4d5caf7bbc00f857688cf9e98255"},{"fixed":"ff04b26794a16a8a879eb4fd2c02c2d6b03850e9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68320.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.24"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68320.json"}}],"schema_version":"1.9.0"}