{
  "id": "CVE-2021-47152",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-03-25T09:15:09.357",
  "lastModified": "2025-03-13T21:24:19.037",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix data stream corruption\n\nMaxim reported several issues when forcing a TCP transparent proxy\nto use the MPTCP protocol for the inbound connections. He also\nprovided a clean reproducer.\n\nThe problem boils down to 'mptcp_frag_can_collapse_to()' assuming\nthat only MPTCP will use the given page_frag.\n\nIf others - e.g. the plain TCP protocol - allocate page fragments,\nwe can end-up re-using already allocated memory for mptcp_data_frag.\n\nFix the issue ensuring that the to-be-expanded data fragment is\nlocated at the current page frag end.\n\nv1 -> v2:\n - added missing fixes tag (Mat)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: mptcp: corrige la corrupci\u00f3n del flujo de datos Maxim inform\u00f3 varios problemas al forzar a un proxy transparente TCP a utilizar el protocolo MPTCP para las conexiones entrantes. Tambi\u00e9n proporcion\u00f3 un reproductor limpio. El problema se reduce a 'mptcp_frag_can_collapse_to()' suponiendo que s\u00f3lo MPTCP utilizar\u00e1 el page_frag dado. Si otros (por ejemplo, el protocolo TCP simple) asignan fragmentos de p\u00e1gina, podemos terminar reutilizando la memoria ya asignada para mptcp_data_frag. Solucione el problema asegur\u00e1ndose de que el fragmento de datos que se va a expandir est\u00e9 ubicado al final del fragmento de la p\u00e1gina actual. v1 -> v2: - se agreg\u00f3 la etiqueta de correcciones faltantes (Mat)"
    }
  ],
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        "type": "Primary",
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          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
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          "value": "CWE-787"
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