fkie_cve-2021-47224
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2025-04-04 14:32
Severity ?
6.2 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ll_temac: Make sure to free skb when it is completely used With the skb pointer piggy-backed on the TX BD, we have a simple and efficient way to free the skb buffer when the frame has been transmitted. But in order to avoid freeing the skb while there are still fragments from the skb in use, we need to piggy-back on the TX BD of the skb, not the first. Without this, we are doing use-after-free on the DMA side, when the first BD of a multi TX BD packet is seen as completed in xmit_done, and the remaining BDs are still being processed.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4bPatch
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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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ll_temac: Make sure to free skb when it is completely used\n\nWith the skb pointer piggy-backed on the TX BD, we have a simple and\nefficient way to free the skb buffer when the frame has been transmitted.\nBut in order to avoid freeing the skb while there are still fragments from\nthe skb in use, we need to piggy-back on the TX BD of the skb, not the\nfirst.\n\nWithout this, we are doing use-after-free on the DMA side, when the first\nBD of a multi TX BD packet is seen as completed in xmit_done, and the\nremaining BDs are still being processed."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: net:ll_temac: Aseg\u00farate de liberar skb cuando est\u00e9 completamente utilizado. Con el puntero skb acoplado en la BD TX, tenemos una forma sencilla y eficaz de liberar el buffer skb. cuando la trama ha sido transmitida. Pero para evitar liberar el skb mientras todav\u00eda hay fragmentos del skb en uso, debemos aprovechar el BD TX del skb, no el primero. Sin esto, estamos haciendo use after free en el lado DMA, cuando el primer BD de un paquete BD de transmisi\u00f3n m\u00faltiple se considera completado en xmit_done y los BD restantes todav\u00eda se est\u00e1n procesando."
    }
  ],
  "id": "CVE-2021-47224",
  "lastModified": "2025-04-04T14:32:24.247",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 6.2,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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  "published": "2024-05-21T15:15:11.687",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-416"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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