{"id":"CVE-2026-89476","revision":"a8fc3848e7d3484c85aeb1225f5cf76a","records":[{"revision":"a8fc3848e7d3484c85aeb1225f5cf76a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89476","aliases":[],"title":"sctp: fix stream->outcnt underflow on duplicate RECONF responses","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix stream->outcnt underflow on duplicate RECONF responses\n\nA cached RECONF chunk may contain more than one request parameter.  A\nduplicate response can therefore find and process the same ADD_OUT request\nagain while another parameter is still outstanding, rolling back outcnt\ntwice and possibly underflowing it.\n\nTrack outstanding request types as bits and clear each bit after its first\nresponse.  Later responses for the same request are then ignored.","state":0,"publishedAt":"2026-09-11T19:43:33.193+00:00","modifiedAt":"2026-10-19T08:47:25.179+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                        \"net/sctp/stream.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3\",\n                            \"lessThan\": \"041f7df5a929d3e7435dd8387e8ea17f2d412b7d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3\",\n                            \"lessThan\": \"59f61c39cb99ee1737bd742a20094fe5653389bb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3\",\n                            \"lessThan\": \"793519e343867ee9a3e84f6cac07f81f2aec7b5d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3\",\n                            \"lessThan\": \"092acd3c55a4077b00489064615d8d2d898daf91\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3\",\n                            \"lessThan\": \"2d867663c563e8009257b9edf9c8ec75d9bbf19a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3\",\n                            \"lessThan\": \"d02a5794c3deedcb8476d017fcee2b7aaedab2e1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3\",\n                            \"lessThan\": \"8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3\",\n                            \"lessThan\": \"3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e\",\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                        \"net/sctp/stream.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.12\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.12\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\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:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/041f7df5a929d3e7435dd8387e8ea17f2d412b7d","https://git.kernel.org/stable/c/59f61c39cb99ee1737bd742a20094fe5653389bb","https://git.kernel.org/stable/c/793519e343867ee9a3e84f6cac07f81f2aec7b5d","https://git.kernel.org/stable/c/092acd3c55a4077b00489064615d8d2d898daf91","https://git.kernel.org/stable/c/2d867663c563e8009257b9edf9c8ec75d9bbf19a","https://git.kernel.org/stable/c/d02a5794c3deedcb8476d017fcee2b7aaedab2e1","https://git.kernel.org/stable/c/8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68","https://git.kernel.org/stable/c/3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89476","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89476","identifiers":["CVE-2026-89476"]},"retained":false,"historicalAffected":[]}],"coverage":[]}