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CVE-2026-81665

Estado: Pendiente de análisisAlta (7.5)—

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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:A (red adyacente) sin privilegios → T1210. Buffer overflow en reassembly puede causar crash (DoS/T1499.004) o ejecución de código (T1059) mediante corrupción de heap con datos controlados.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementDisable or Remove Feature or ProgramVulnerability ScanningThreat Intelligence ProgramRestrict Web-Based ContentNetwork Segmentation

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Corosync — CorosyncAI

CWE

Referencias

JSON original (NVD)

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      "url": "https://access.redhat.com/errata/RHSA-2026:67872",
      "source": "secalert@redhat.com"
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    {
      "url": "https://access.redhat.com/errata/RHSA-2026:67873",
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      "url": "https://access.redhat.com/errata/RHSA-2026:67878",
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      "url": "https://access.redhat.com/errata/RHSA-2026:67879",
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    {
      "url": "https://access.redhat.com/errata/RHSA-2026:67880",
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    {
      "url": "https://access.redhat.com/errata/RHSA-2026:67881",
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    {
      "url": "https://access.redhat.com/errata/RHSA-2026:68574",
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      "url": "https://access.redhat.com/errata/RHSA-2026:69277",
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      "url": "https://access.redhat.com/errata/RHSA-2026:69278",
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      "url": "https://access.redhat.com/errata/RHSA-2026:69279",
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      "url": "https://access.redhat.com/errata/RHSA-2026:69280",
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      "url": "https://access.redhat.com/security/cve/CVE-2026-81665",
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      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524910",
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  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        }
      ]
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    {
      "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": "2026-09-30T07:16:29.567",
  "sourceIdentifier": "secalert@redhat.com"
}