nvd-json-data-feeds/CVE-2021/CVE-2021-470xx/CVE-2021-47010.json

{
  "id": "CVE-2021-47010",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-02-28T09:15:38.657",
  "lastModified": "2025-03-19T15:30:02.273",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Only allow init netns to set default tcp cong to a restricted algo\n\ntcp_set_default_congestion_control() is netns-safe in that it writes\nto &net->ipv4.tcp_congestion_control, but it also sets\nca->flags |= TCP_CONG_NON_RESTRICTED which is not namespaced.\nThis has the unintended side-effect of changing the global\nnet.ipv4.tcp_allowed_congestion_control sysctl, despite the fact that it\nis read-only: 97684f0970f6 (\"net: Make tcp_allowed_congestion_control\nreadonly in non-init netns\")\n\nResolve this netns \"leak\" by only allowing the init netns to set the\ndefault algorithm to one that is restricted. This restriction could be\nremoved if tcp_allowed_congestion_control were namespace-ified in the\nfuture.\n\nThis bug was uncovered with\nhttps://github.com/JonathonReinhart/linux-netns-sysctl-verify"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: solo permite que init netns establezca la cong tcp predeterminada en un algoritmo restringido tcp_set_default_congestion_control() es seguro para netns porque escribe en &net->ipv4.tcp_congestion_control, pero tambi\u00e9n establece ca->flags |= TCP_CONG_NON_RESTRICTED que no tiene espacio de nombres. Esto tiene el efecto secundario no deseado de cambiar el sistema global net.ipv4.tcp_allowed_congestion_control, a pesar de que es de solo lectura: 97684f0970f6 (\"net: Make tcp_allowed_congestion_control readonly in non-init netns\") Resuelva esta \"fuga\" de netns solo permite que las redes de inicio establezcan el algoritmo predeterminado en uno restringido. Esta restricci\u00f3n podr\u00eda eliminarse si tcp_allowed_congestion_control tuviera un espacio de nombres en el futuro. Este error se descubri\u00f3 con https://github.com/JonathonReinhart/linux-netns-sysctl-verify"
    }
  ],
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        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
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        "exploitabilityScore": 1.8,
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      "type": "Secondary",
      "description": [
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          "lang": "en",
          "value": "CWE-400"
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    }
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