{"id":"CVE-2026-68376","revision":"ad6211a8d14e43b8976cbfba137edad4","records":[{"revision":"ad6211a8d14e43b8976cbfba137edad4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-68376","aliases":[],"title":"sctp: fix auth_hmacs array size in struct sctp_cookie","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix auth_hmacs array size in struct sctp_cookie\n\nThe auth_hmacs array in struct sctp_cookie is supposed to store a complete\nSCTP_AUTH_HMAC_ALGO parameter, which consists of a struct sctp_paramhdr\nfollowed by N HMAC identifiers.\n\nHowever, the array size was calculated using an extra 2 bytes instead of\nsizeof(struct sctp_paramhdr), which is 4 bytes. When four HMAC identifiers\nare configured, the HMAC-ALGO parameter stored in the endpoint is larger\nthan the auth_hmacs buffer in the cookie.\n\nAs a result, sctp_association_init() copies beyond the end of auth_hmacs\nwhen initializing the association, corrupting the adjacent auth_chunks\nfield. This can lead to an invalid HMAC identifier being accepted and later\ncause an out-of-bounds read in sctp_auth_get_hmac().\n\nFix the array size calculation by including the full SCTP parameter header\nsize.","state":0,"publishedAt":"2026-08-10T12:03:54.666+00:00","modifiedAt":"2026-10-19T21:09:06.621+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                        \"include/net/sctp/structs.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1f485649f52929d9937b346a920a522a7363e202\",\n                            \"lessThan\": \"317731d01b03c529809df36d3a7d149677a8729d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1f485649f52929d9937b346a920a522a7363e202\",\n                            \"lessThan\": \"0528485f27016a42804abe01aa61b39d85fa803e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1f485649f52929d9937b346a920a522a7363e202\",\n                            \"lessThan\": \"ee5e65964f456adfe14d526fba0bd055de98ecf3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1f485649f52929d9937b346a920a522a7363e202\",\n                            \"lessThan\": \"0b4414e43e0861d67276031cc21401d7e87de3da\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1f485649f52929d9937b346a920a522a7363e202\",\n                            \"lessThan\": \"d0a59ba58578e2b330fff80a44fe519f3ba7d8c7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1f485649f52929d9937b346a920a522a7363e202\",\n                            \"lessThan\": \"a8d20ba0ab518c9ccbcde258f25fc1ee6e51d5db\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1f485649f52929d9937b346a920a522a7363e202\",\n                            \"lessThan\": \"3aa40c3bccac2312ea7cf97f329190637f972b5d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1f485649f52929d9937b346a920a522a7363e202\",\n                            \"lessThan\": \"e0b5252a59383b77d1b8dbeda00b7184dd95f4d3\",\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                        \"include/net/sctp/structs.h\"\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:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/317731d01b03c529809df36d3a7d149677a8729d","https://git.kernel.org/stable/c/0528485f27016a42804abe01aa61b39d85fa803e","https://git.kernel.org/stable/c/ee5e65964f456adfe14d526fba0bd055de98ecf3","https://git.kernel.org/stable/c/0b4414e43e0861d67276031cc21401d7e87de3da","https://git.kernel.org/stable/c/d0a59ba58578e2b330fff80a44fe519f3ba7d8c7","https://git.kernel.org/stable/c/a8d20ba0ab518c9ccbcde258f25fc1ee6e51d5db","https://git.kernel.org/stable/c/3aa40c3bccac2312ea7cf97f329190637f972b5d","https://git.kernel.org/stable/c/e0b5252a59383b77d1b8dbeda00b7184dd95f4d3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68376","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-68376","identifiers":["CVE-2026-68376"]},"retained":false,"historicalAffected":[]}],"coverage":[]}