{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89476", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.711Z", "datePublished": "2026-09-11T19:43:33.193Z", "dateUpdated": "2026-09-11T19:43:33.193Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:43:33.193Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/sctp/structs.h", "net/sctp/stream.c"], "versions": [{"version": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3", "lessThan": "2d867663c563e8009257b9edf9c8ec75d9bbf19a", "status": "affected", "versionType": "git"}, {"version": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3", "lessThan": "d02a5794c3deedcb8476d017fcee2b7aaedab2e1", "status": "affected", "versionType": "git"}, {"version": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3", "lessThan": "8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68", "status": "affected", "versionType": "git"}, {"version": "11ae76e67a179f25ae8f772d62a7ddf717b1cdf3", "lessThan": "3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/sctp/structs.h", "net/sctp/stream.c"], "versions": [{"version": "4.12", "status": "affected"}, {"version": "0", "lessThan": "4.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.3-rc1"}]}]}], "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"}}}}

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{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-89476", "lastModified": "2026-09-11T20:19:28.930", "metrics": {}, "published": "2026-09-11T20:19:28.930", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2d867663c563e8009257b9edf9c8ec75d9bbf19a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d02a5794c3deedcb8476d017fcee2b7aaedab2e1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: SCTP stream counter underflow via duplicate RECONF responses", "id": "2532035", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532035"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-191", "details": ["A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. A remote attacker could exploit this by sending specially crafted duplicate RECONF responses. This action can cause an underflow in the `stream->outcnt` counter, potentially leading to unexpected system behavior or a denial of service (DoS) condition."], "name": "CVE-2026-89476", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-11T19:43:33Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89476\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89476\nhttps://git.kernel.org/stable/c/2d867663c563e8009257b9edf9c8ec75d9bbf19a\nhttps://git.kernel.org/stable/c/3faf13aff243ca9f78d08b1a2956ef5a6fc77b6e\nhttps://git.kernel.org/stable/c/8320cbd81bc21a1ca6ebdf70ad610ebc5ef1bd68\nhttps://git.kernel.org/stable/c/d02a5794c3deedcb8476d017fcee2b7aaedab2e1"], "threat_severity": "Important"}

{}