fkie_cve-2021-47013
Vulnerability from fkie_nvd
Published
2024-02-28 09:15
Modified
2024-12-09 17:59
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:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send\n\nIn emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..).\nIf some error happens in emac_tx_fill_tpd(), the skb will be freed via\ndev_kfree_skb(skb) in error branch of emac_tx_fill_tpd().\nBut the freed skb is still used via skb-\u003elen by netdev_sent_queue(,skb-\u003elen).\n\nAs i observed that emac_tx_fill_tpd() haven\u0027t modified the value of skb-\u003elen,\nthus my patch assigns skb-\u003elen to \u0027len\u0027 before the possible free and\nuse \u0027len\u0027 instead of skb-\u003elen later."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: net:emac/emac-mac: Se corrige un uso after free en emac_mac_tx_buf_send En emac_mac_tx_buf_send, llama a emac_tx_fill_tpd(..,skb,..). Si ocurre alg\u00fan error en emac_tx_fill_tpd(), el skb se liberar\u00e1 mediante dev_kfree_skb(skb) en la rama de error de emac_tx_fill_tpd(). Pero el skb liberado todav\u00eda se usa a trav\u00e9s de skb-\u0026gt;len por netdev_sent_queue(,skb-\u0026gt;len). Como observ\u00e9 que emac_tx_fill_tpd() no ha modificado el valor de skb-\u0026gt;len, por lo tanto mi parche asigna skb-\u0026gt;len a \u0027len\u0027 antes del posible free y usa \u0027len\u0027 en lugar de skb-\u0026gt;len m\u00e1s tarde."
    }
  ],
  "id": "CVE-2021-47013",
  "lastModified": "2024-12-09T17:59:07.173",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-02-28T09:15:38.800",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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