{"api_version":"1","generated_at":"2026-09-12T03:40:09+00:00","cve":"CVE-2026-89476","urls":{"html":"https://cve.report/CVE-2026-89476","api":"https://cve.report/api/cve/CVE-2026-89476.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89476","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89476"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:28","updated_at":"2026-09-11 20:19:28"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e","name":"https://git.kernel.org/stable/c/3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d02a5794c3deedcb8476d017fcee2b7aaedab2e1","name":"https://git.kernel.org/stable/c/d02a5794c3deedcb8476d017fcee2b7aaedab2e1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68","name":"https://git.kernel.org/stable/c/8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2d867663c563e8009257b9edf9c8ec75d9bbf19a","name":"https://git.kernel.org/stable/c/2d867663c563e8009257b9edf9c8ec75d9bbf19a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89476","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89476","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 2d867663c563e8009257b9edf9c8ec75d9bbf19a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 d02a5794c3deedcb8476d017fcee2b7aaedab2e1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11ae76e67a179f25ae8f772d62a7ddf717b1cdf3 3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.12","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/net/sctp/structs.h","net/sctp/stream.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2d867663c563e8009257b9edf9c8ec75d9bbf19a","status":"affected","version":"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3","versionType":"git"},{"lessThan":"d02a5794c3deedcb8476d017fcee2b7aaedab2e1","status":"affected","version":"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3","versionType":"git"},{"lessThan":"8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68","status":"affected","version":"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3","versionType":"git"},{"lessThan":"3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e","status":"affected","version":"11ae76e67a179f25ae8f772d62a7ddf717b1cdf3","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/net/sctp/structs.h","net/sctp/stream.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.12"},{"lessThan":"4.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"4.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"4.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"4.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"4.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:43:33.193Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2d867663c563e8009257b9edf9c8ec75d9bbf19a"},{"url":"https://git.kernel.org/stable/c/d02a5794c3deedcb8476d017fcee2b7aaedab2e1"},{"url":"https://git.kernel.org/stable/c/8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68"},{"url":"https://git.kernel.org/stable/c/3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e"}],"title":"sctp: fix stream->outcnt underflow on duplicate RECONF responses","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89476","datePublished":"2026-09-11T19:43:33.193Z","dateReserved":"2026-09-11T19:38:34.711Z","dateUpdated":"2026-09-11T19:43:33.193Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:28","lastModifiedDate":"2026-09-11 20:19:28","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89476","Ordinal":"1","Title":"sctp: fix stream->outcnt underflow on duplicate RECONF responses","CVE":"CVE-2026-89476","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89476","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"sctp: fix stream->outcnt underflow on duplicate RECONF responses"}]}}}