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CVE-2019-8956

Estado: ModificadaAlta (7.8)—💥 PoC

En el kernel de Linux, en versiones anteriores a las 4.20.8 y 4.19.21, un error de uso de memoria previamente liberada en la función "sctp_sendmsg()" (net/sctp/socket.c) al gestionar la marca SCTP_SENDALL puede explotarse para corromper memoria

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).

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

⚠️ Las pruebas de concepto de GitHub no están verificadas: algunas son falsas o contienen malware. No las ejecute nunca fuera de un laboratorio aislado.

Tecnologías afectadas (2)

Canonical — Ubuntu LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2019-8956",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.2,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
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        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 1.8
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  },
  "affected": [
    {
      "source": "PSIRT-CNA@flexerasoftware.com",
      "affectedData": [
        {
          "vendor": "UNKNOWN",
          "product": "Linux Kernel",
          "versions": [
            {
              "status": "affected",
              "version": "4.20.x prior to 4.20.8"
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  "published": "2019-04-01T19:29:01.300",
  "references": [
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      "url": "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.21",
      "tags": [
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        "Vendor Advisory"
      ],
      "source": "PSIRT-CNA@flexerasoftware.com"
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      "tags": [
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      "source": "PSIRT-CNA@flexerasoftware.com"
    },
    {
      "url": "https://support.f5.com/csp/article/K12671141",
      "tags": [
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      "source": "PSIRT-CNA@flexerasoftware.com"
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      "tags": [
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    },
    {
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    },
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      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        },
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux Kernel before versions 4.20.8 and 4.19.21 a use-after-free error in the \"sctp_sendmsg()\" function (net/sctp/socket.c) when handling SCTP_SENDALL flag can be exploited to corrupt memory."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, en versiones anteriores a las 4.20.8 y 4.19.21, un error de uso de memoria previamente liberada en la función \"sctp_sendmsg()\" (net/sctp/socket.c) al gestionar la marca SCTP_SENDALL puede explotarse para corromper memoria"
    }
  ],
  "lastModified": "2026-06-17T02:42:50.973",
  "configurations": [
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