{ "document": { "aggregate_severity": { "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" }, { "category": "details", "text": "CVE-2026-81665: replace the assert in totempg_deliver_fn with a runtime bounds\n check so an oversized fragmented message is logged and ignored instead of\n overflowing the assembly reassembly buffer when asserts are compiled out", "title": "Details" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790008457", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790008457" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/tuxcare9.6esu/advisories/2026/clsa-2026_1790008457.json" } ], "tracking": { "current_release_date": "2026-09-21T16:34:57Z", "generator": { "date": "2026-09-21T16:34:57Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1790008457", "initial_release_date": "2026-09-21T16:34:57Z", "revision_history": [ { "date": "2026-09-21T16:34:57Z", "number": "1", "summary": "Initial version" } ], "status": "final", "version": "1" }, "title": "corosync: Fix of CVE-2026-81665" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "AlmaLinux 9.6", "product": { "name": "AlmaLinux 9.6", "product_id": "AlmaLinux-9.6", "product_identification_helper": { "cpe": "cpe:2.3:o:almalinux:almalinux:9.6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "AlmaLinux" } ], "category": "vendor", "name": "AlmaLinux OS Foundation" }, { "branches": [ { "branches": [ { "category": "product_name", "name": "Rocky Linux 9.6", "product": { "name": "Rocky Linux 9.6", "product_id": "Rocky Linux-9.6", "product_identification_helper": { "cpe": 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Linux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els1.i686" }, "product_reference": "corosynclib-0:3.1.9-2.el9_6.tuxcare.els1.i686", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "corosync-vqsim-0:3.1.9-2.el9_6.tuxcare.els1.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:corosync-vqsim-0:3.1.9-2.el9_6.tuxcare.els1.x86_64" }, "product_reference": "corosync-vqsim-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-81665", "cwe": { "id": "CWE-122", "name": "Heap-based Buffer Overflow" }, "notes": [ { "category": "description", "text": "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.", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "AlmaLinux-9.6:corosync-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "AlmaLinux-9.6:corosync-vqsim-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "AlmaLinux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els2.i686", "AlmaLinux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "AlmaLinux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els2.i686", "AlmaLinux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "Rocky Linux-9.6:corosync-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "Rocky Linux-9.6:corosync-vqsim-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "Rocky Linux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els2.i686", "Rocky Linux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "Rocky Linux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els2.i686", "Rocky Linux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els2.x86_64" ], "known_affected": [ "AlmaLinux-9.6:corosync-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:corosync-vqsim-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els1.i686", "AlmaLinux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els1.i686", "AlmaLinux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:corosync-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:corosync-vqsim-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els1.i686", "Rocky Linux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els1.i686", "Rocky Linux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-81665" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:67872", "url": "https://access.redhat.com/errata/RHSA-2026:67872" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:67873", "url": "https://access.redhat.com/errata/RHSA-2026:67873" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:67878", "url": "https://access.redhat.com/errata/RHSA-2026:67878" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:67879", "url": "https://access.redhat.com/errata/RHSA-2026:67879" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:67880", "url": "https://access.redhat.com/errata/RHSA-2026:67880" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:67881", "url": "https://access.redhat.com/errata/RHSA-2026:67881" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:68574", "url": "https://access.redhat.com/errata/RHSA-2026:68574" }, { "category": "external", "summary": "https://access.redhat.com/security/cve/CVE-2026-81665", "url": "https://access.redhat.com/security/cve/CVE-2026-81665" }, { "category": "external", "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2524910", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524910" } ], "release_date": "2026-09-04T09:17:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-09-21T16:34:19.370702Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1790008457", "product_ids": [ "AlmaLinux-9.6:corosync-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "AlmaLinux-9.6:corosync-vqsim-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "AlmaLinux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els2.i686", "AlmaLinux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "AlmaLinux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els2.i686", "AlmaLinux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "Rocky Linux-9.6:corosync-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "Rocky Linux-9.6:corosync-vqsim-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "Rocky Linux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els2.i686", "Rocky Linux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els2.x86_64", "Rocky Linux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els2.i686", "Rocky Linux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els2.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1790008457" }, { "category": "none_available", "date": "2026-09-04T09:17:00Z", "details": "Affected", "product_ids": [ "AlmaLinux-9.6:corosync-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:corosync-vqsim-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els1.i686", "AlmaLinux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "AlmaLinux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els1.i686", "AlmaLinux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:corosync-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:corosync-vqsim-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els1.i686", "Rocky Linux-9.6:corosynclib-0:3.1.9-2.el9_6.tuxcare.els1.x86_64", "Rocky Linux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els1.i686", "Rocky Linux-9.6:corosynclib-devel-0:3.1.9-2.el9_6.tuxcare.els1.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }