« Volver al listado

CVE-2026-80586

Estado: RecibidaCrítica (9.8)—

In the Linux kernel, the following vulnerability has been resolved:

mptcp: options: reset DSS fields in case of unexpected size

A remote peer could send a malformed DSS with a wrong size, followed by another DSS or MPC + Data. In this case, the first suboption will be ignored, but leaving some fields written, which could lead to inconsistency or access uninitialized data.

Explicitly reset the fields that could have been modified in case of unexpected size.

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.

Red sin autenticación (AV:N/PR:N) permite envío remoto de paquetes MPTCP malformados (DSS) causando inconsistencia de memoria o lectura de datos no inicializados en kernel Linux.

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

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Tecnologías afectadas (1)

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

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-80586",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
              "lessThan": "15e35fdad7a5576bf3f1c8d688877aeb5d1b506b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
              "lessThan": "b1256090816ec46011601e084be580731df58fc7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
              "lessThan": "192878df582c51d440bf7b91a15f297f29f2b596",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
              "lessThan": "26dac5c9ffb20812b475fdf253eb04fab99cff3b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
              "lessThan": "4e80eff5c1c893aca2ac1d202f0b256d2e52ecde",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
              "lessThan": "1fade1b2ac5b1a4948e538fae7313bea57b5ac36",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
              "lessThan": "27ed642a4e7e4b5df4b8522c72c457a67e052493",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
              "lessThan": "35772b4981f38ba8059372cde8753e8e477e98ec",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/mptcp/options.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.6"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.6",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.266",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.153",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.105",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.46",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.10",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/mptcp/options.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-26T15:17:14.873",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/15e35fdad7a5576bf3f1c8d688877aeb5d1b506b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/192878df582c51d440bf7b91a15f297f29f2b596",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1fade1b2ac5b1a4948e538fae7313bea57b5ac36",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/26dac5c9ffb20812b475fdf253eb04fab99cff3b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/27ed642a4e7e4b5df4b8522c72c457a67e052493",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/35772b4981f38ba8059372cde8753e8e477e98ec",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4e80eff5c1c893aca2ac1d202f0b256d2e52ecde",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b1256090816ec46011601e084be580731df58fc7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: options: reset DSS fields in case of unexpected size\n\nA remote peer could send a malformed DSS with a wrong size, followed by\nanother DSS or MPC + Data. In this case, the first suboption will be\nignored, but leaving some fields written, which could lead to\ninconsistency or access uninitialized data.\n\nExplicitly reset the fields that could have been modified in case of\nunexpected size."
    }
  ],
  "lastModified": "2026-08-27T06:17:45.700",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}