FKIE_CVE-2021-47010

Vulnerability from fkie_nvd - Published: 2024-02-28 09:15 - Updated: 2025-03-19 15:30
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: Only allow init netns to set default tcp cong to a restricted algo tcp_set_default_congestion_control() is netns-safe in that it writes to &net->ipv4.tcp_congestion_control, but it also sets ca->flags |= TCP_CONG_NON_RESTRICTED which is not namespaced. This has the unintended side-effect of changing the global net.ipv4.tcp_allowed_congestion_control sysctl, despite the fact that it is read-only: 97684f0970f6 ("net: Make tcp_allowed_congestion_control readonly in non-init netns") Resolve this netns "leak" by only allowing the init netns to set the default algorithm to one that is restricted. This restriction could be removed if tcp_allowed_congestion_control were namespace-ified in the future. This bug was uncovered with https://github.com/JonathonReinhart/linux-netns-sysctl-verify
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9cPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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    {
      "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 \u0026net-\u003eipv4.tcp_congestion_control, but it also sets\nca-\u003eflags |= 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"
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      "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 \u0026amp;net-\u0026gt;ipv4.tcp_congestion_control, pero tambi\u00e9n establece ca-\u0026gt;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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  "id": "CVE-2021-47010",
  "lastModified": "2025-03-19T15:30:02.273",
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          "attackVector": "LOCAL",
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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  "published": "2024-02-28T09:15:38.657",
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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