FKIE_CVE-2021-47109

Vulnerability from fkie_nvd - Published: 2024-03-15 21:15 - Updated: 2025-02-27 03:23
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: neighbour: allow NUD_NOARP entries to be forced GCed IFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. It's possible to fill up the neighbour table with enough entries that it will overflow for valid connections after that. This behaviour is more prevalent after commit 58956317c8de ("neighbor: Improve garbage collection") is applied, as it prevents removal from entries that are not NUD_FAILED, unless they are more than 5s old.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfcPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfcPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
To clipboard 

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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nneighbour: allow NUD_NOARP entries to be forced GCed\n\nIFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. It\u0027s possible to\nfill up the neighbour table with enough entries that it will overflow for\nvalid connections after that.\n\nThis behaviour is more prevalent after commit 58956317c8de (\"neighbor:\nImprove garbage collection\") is applied, as it prevents removal from\nentries that are not NUD_FAILED, unless they are more than 5s old."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: vecino: permite forzar las entradas NUD_NOARP. Las interfaces GCed IFF_POINTOPOINT utilizan entradas NUD_NOARP para IPv6. Es posible llenar la tabla de vecinos con suficientes entradas para que despu\u00e9s de eso se desborde de conexiones v\u00e1lidas. Este comportamiento es m\u00e1s frecuente despu\u00e9s de aplicar el commit 58956317c8de (\"vecino: mejorar la recolecci\u00f3n de basura\"), ya que evita la eliminaci\u00f3n de entradas que no son NUD_FAILED, a menos que tengan m\u00e1s de 5 a\u00f1os de antig\u00fcedad."
    }
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  "id": "CVE-2021-47109",
  "lastModified": "2025-02-27T03:23:15.750",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
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  "published": "2024-03-15T21:15:06.457",
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  "vulnStatus": "Analyzed",
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          "value": "CWE-190"
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      "source": "nvd@nist.gov",
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  • 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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