{
  "cveId": "CVE-2026-81665",
  "url": "https://patchblox.com/security/cve/CVE-2026-81665",
  "summary": "CVE-2026-81665 is fixed in 9 products on 1 platform, first by ALSA-2026:67872, released September 16, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "corosync: A heap-based buffer overflow was found in Corosync\u0027s Totem Process Group (totempg) message reassembly",
  "description": "A heap-based buffer overflow was found in Corosync\u0027s 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.",
  "published": "2026-09-04T08:30:05Z",
  "severity": "important",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00416,
  "epssPercentile": 0.36153,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "corosync",
      "release": "RHEL 10",
      "fixedVersion": "3.1.9-1.el10_0.3",
      "fix": "RHSA-2026:67881",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-67881",
      "released": "2026-09-17T18:11:06Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.8-1.el8_10.2",
      "fix": "RHSA-2026:69277",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-69277",
      "released": "2026-09-22T19:07:45Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "RHEL 9",
      "fixedVersion": "0:3.1.10-1.el9_8.2",
      "fix": "RHSA-2026:67873",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-67873",
      "released": "2026-09-19T18:32:55Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "almalinux 10",
      "fixedVersion": "3.1.10-1.el10_2.2",
      "fix": "ALSA-2026:67872",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-67872",
      "released": "2026-09-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "almalinux 8",
      "fixedVersion": "3.1.8-1.el8_10.2",
      "fix": "ALSA-2026:69277",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-69277",
      "released": "2026-09-21T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "almalinux 9",
      "fixedVersion": "3.1.10-1.el9_8.2",
      "fix": "ALSA-2026:67873",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-67873",
      "released": "2026-09-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "amzn 2023",
      "fixedVersion": "3.1.9-3.amzn2023.0.3",
      "fix": "ALAS2023-2026-3138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3138",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "ol 10",
      "fixedVersion": "0:3.1.10-1.el10_2.2",
      "fix": "ELSA-2026-67872",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-67872",
      "released": "2026-09-29T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "ol 8",
      "fixedVersion": "0:3.1.8-1.el8_10.2",
      "fix": "ELSA-2026-69277",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-69277",
      "released": "2026-09-23T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "ol 9",
      "fixedVersion": "0:3.1.10-1.el9_8.2",
      "fix": "ELSA-2026-67873",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-67873",
      "released": "2026-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "3.1.9-160000.4.1",
      "fix": "OPENSUSE-SU-2026:21887-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21887-1",
      "released": "2026-09-20T04:53:02Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "rocky 10",
      "fixedVersion": "0:3.1.10-1.el10_2.2",
      "fix": "RLSA-2026:67872",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-67872",
      "released": "2026-09-17T12:09:45Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "rocky 8",
      "fixedVersion": "0:3.1.8-1.el8_10.2",
      "fix": "RLSA-2026:69277",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-69277",
      "released": "2026-09-23T06:01:17Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "rocky 9",
      "fixedVersion": "0:3.1.10-1.el9_8.2",
      "fix": "RLSA-2026:67873",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-67873",
      "released": "2026-09-17T06:06:39Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "sles 15.6",
      "fixedVersion": "2.4.6-150300.12.19.1",
      "fix": "SUSE-SU-2026:4202-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4202-1",
      "released": "2026-09-16T08:18:19Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "sles 15.7",
      "fixedVersion": "2.4.6-150300.12.19.1",
      "fix": "SUSE-SU-2026:4202-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4202-1",
      "released": "2026-09-16T08:18:19Z"
    },
    {
      "platform": "linux",
      "product": "corosync",
      "release": "sles 16.0",
      "fixedVersion": "3.1.9-160000.4.1",
      "fix": "SUSE-SU-2026:23850-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23850-1",
      "released": "2026-09-20T04:53:53Z"
    },
    {
      "platform": "linux",
      "product": "corosync-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "3.1.9-3.amzn2023.0.3",
      "fix": "ALAS2023-2026-3138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3138",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "3.1.9-3.amzn2023.0.3",
      "fix": "ALAS2023-2026-3138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3138",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync-vqsim",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.8-1.el8_10.2",
      "fix": "RHSA-2026:69277",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-69277",
      "released": "2026-09-22T19:07:45Z"
    },
    {
      "platform": "linux",
      "product": "corosync-vqsim",
      "release": "RHEL 9",
      "fixedVersion": "0:3.1.10-1.el9_8.2",
      "fix": "RHSA-2026:67873",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-67873",
      "released": "2026-09-19T18:32:55Z"
    },
    {
      "platform": "linux",
      "product": "corosync-vqsim",
      "release": "almalinux 10",
      "fixedVersion": "3.1.10-1.el10_2.2",
      "fix": "ALSA-2026:67872",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-67872",
      "released": "2026-09-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync-vqsim",
      "release": "almalinux 8",
      "fixedVersion": "3.1.8-1.el8_10.2",
      "fix": "ALSA-2026:69277",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-69277",
      "released": "2026-09-21T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync-vqsim",
      "release": "almalinux 9",
      "fixedVersion": "3.1.10-1.el9_8.2",
      "fix": "ALSA-2026:67873",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-67873",
      "released": "2026-09-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync-vqsim",
      "release": "amzn 2023",
      "fixedVersion": "3.1.9-3.amzn2023.0.3",
      "fix": "ALAS2023-2026-3138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3138",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync-vqsim",
      "release": "ol 10",
      "fixedVersion": "0:3.1.10-1.el10_2.2",
      "fix": "ELSA-2026-67872",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-67872",
      "released": "2026-09-29T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync-vqsim",
      "release": "ol 8",
      "fixedVersion": "0:3.1.8-1.el8_10.2",
      "fix": "ELSA-2026-69277",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-69277",
      "released": "2026-09-23T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync-vqsim",
      "release": "ol 9",
      "fixedVersion": "0:3.1.10-1.el9_8.2",
      "fix": "ELSA-2026-67873",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-67873",
      "released": "2026-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "corosync-vqsim-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "3.1.9-3.amzn2023.0.3",
      "fix": "ALAS2023-2026-3138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3138",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
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      "release": "RHEL 8",
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      "fix": "RHSA-2026:69277",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-69277",
      "released": "2026-09-22T19:07:45Z"
    },
    {
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      "fix": "RHSA-2026:67873",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-67873",
      "released": "2026-09-19T18:32:55Z"
    },
    {
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      "fix": "ALSA-2026:67872",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-67872",
      "released": "2026-09-16T00:00:00Z"
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      "fix": "ALSA-2026:69277",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-69277",
      "released": "2026-09-21T00:00:00Z"
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    {
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      "fix": "ALSA-2026:67873",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-67873",
      "released": "2026-09-16T00:00:00Z"
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    {
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3138",
      "released": "2026-09-28T09:00:00Z"
    },
    {
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      "fix": "ELSA-2026-67872",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-67872",
      "released": "2026-09-29T00:00:00Z"
    },
    {
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      "fixedVersion": "0:3.1.8-1.el8_10.2",
      "fix": "ELSA-2026-69277",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-69277",
      "released": "2026-09-23T00:00:00Z"
    },
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      "fix": "ELSA-2026-67873",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-67873",
      "released": "2026-09-22T00:00:00Z"
    },
    {
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      "product": "corosynclib-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "3.1.9-3.amzn2023.0.3",
      "fix": "ALAS2023-2026-3138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3138",
      "released": "2026-09-28T09:00:00Z"
    },
    {
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      "fixedVersion": "0:3.1.8-1.el8_10.2",
      "fix": "RHSA-2026:69277",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-69277",
      "released": "2026-09-22T19:07:45Z"
    },
    {
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      "fixedVersion": "0:3.1.10-1.el9_8.2",
      "fix": "RHSA-2026:67873",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-67873",
      "released": "2026-09-19T18:32:55Z"
    },
    {
      "platform": "linux",
      "product": "corosynclib-devel",
      "release": "almalinux 10",
      "fixedVersion": "3.1.10-1.el10_2.2",
      "fix": "ALSA-2026:67872",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-67872",
      "released": "2026-09-16T00:00:00Z"
    },
    {
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      "product": "corosynclib-devel",
      "release": "almalinux 8",
      "fixedVersion": "3.1.8-1.el8_10.2",
      "fix": "ALSA-2026:69277",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-69277",
      "released": "2026-09-21T00:00:00Z"
    },
    {
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      "fix": "ALSA-2026:67873",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-67873",
      "released": "2026-09-16T00:00:00Z"
    },
    {
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      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-3138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3138",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "spausedd",
      "release": "RHEL 8",
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      "fix": "RHSA-2026:69277",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-69277",
      "released": "2026-09-22T19:07:45Z"
    },
    {
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      "fix": "ALSA-2026:69277",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-69277",
      "released": "2026-09-21T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}