CVE-2026-81665

{"id": "CVE-2026-81665", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-81665", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-09-04T17:09:13.395902Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secalert@redhat.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.6}]}, "affected": [{"source": "secalert@redhat.com", "affectedData": [{"cpes": ["cpe:/o:redhat:enterprise_linux:10.2"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "versions": [{"status": "unaffected", "version": "0:3.1.10-1.el10_2.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux_eus:10.0"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10.0 Extended Update Support", "versions": [{"status": "unaffected", "version": "0:3.1.9-1.el10_0.3", "lessThan": "*", "versionType": "rpm"}], "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:enterprise_linux:9::appstream", "cpe:/a:redhat:enterprise_linux:9::crb", "cpe:/a:redhat:enterprise_linux:9::highavailability", "cpe:/a:redhat:enterprise_linux:9::resilientstorage"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "versions": [{"status": "unaffected", "version": "0:3.1.10-1.el9_8.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_e4s:9.4::appstream", "cpe:/a:redhat:rhel_e4s:9.4::highavailability", "cpe:/a:redhat:rhel_e4s:9.4::resilientstorage"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions", "versions": [{"status": "unaffected", "version": "0:3.1.8-1.el9_4.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_eus:9.6::appstream", "cpe:/a:redhat:rhel_eus:9.6::crb", "cpe:/a:redhat:rhel_eus:9.6::highavailability", "cpe:/a:redhat:rhel_eus:9.6::resilientstorage"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.6 Extended Update Support", "versions": [{"status": "unaffected", "version": "0:3.1.9-2.el9_6.2", "lessThan": "*", "versionType": "rpm"}], "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:7"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift:4"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "packageName": "openshift/ose-rhel-coreos-9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift:4"], "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "packageName": "rhcos", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}]}], "published": "2026-09-04T09:17:11.357", "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:67872", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:67873", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:67878", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:67879", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:67881", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-81665", "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524910", "source": "secalert@redhat.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-122"}]}], "descriptions": [{"lang": "en", "value": "A heap-based buffer overflow was found in Corosync's Totem Process Group (totempg) message reassembly. When processing fragmented multicast messages, the buffer used to reassemble fragments lacks a runtime bounds check in release builds. A network-adjacent attacker able to send crafted multicast protocol messages to the cluster could cause a heap buffer overflow with attacker-controlled data. This can crash the Corosync daemon, causing a denial of service to the entire cluster, and may potentially allow further exploitation given sufficient heap-corruption control."}], "lastModified": "2026-09-16T14:17:10.667", "sourceIdentifier": "secalert@redhat.com"}