gsd-2021-46952
Vulnerability from gsd
Modified
2024-02-26 06:03
Details
In the Linux kernel, the following vulnerability has been resolved: NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds Fix shift out-of-bounds in xprt_calc_majortimeo(). This is caused by a garbage timeout (retrans) mount option being passed to nfs mount, in this case from syzkaller. If the protocol is XPRT_TRANSPORT_UDP, then 'retrans' is a shift value for a 64-bit long integer, so 'retrans' cannot be >= 64. If it is >= 64, fail the mount and return an error.
Aliases


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{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-46952"
      ],
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      "id": "GSD-2021-46952",
      "modified": "2024-02-26T06:03:52.295598Z",
      "schema_version": "1.4.0"
    }
  },
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          },
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            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFS: fs_context: valida las retransmisiones UDP para evitar cambios fuera de los l\u00edmites. Corrige cambios fuera de los l\u00edmites en xprt_calc_majortimeo(). Esto se debe a que se pasa una opci\u00f3n de montaje de tiempo de espera de basura (retransmisi\u00f3n) al montaje nfs, en este caso desde syzkaller. Si el protocolo es XPRT_TRANSPORT_UDP, entonces \u0027retrans\u0027 es un valor de desplazamiento para un entero largo de 64 bits, por lo que \u0027retrans\u0027 no puede ser \u0026gt;= 64. Si es \u0026gt;= 64, falla el montaje y devuelve un error."
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        "id": "CVE-2021-46952",
        "lastModified": "2024-04-10T20:15:42.153",
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
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                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
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        "published": "2024-02-27T19:04:06.517",
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    }
  }
}


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