gsd-2021-47013
Vulnerability from gsd
Modified
2024-02-28 06:03
Details
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.
Aliases


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{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-47013"
      ],
      "details": "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.",
      "id": "GSD-2021-47013",
      "modified": "2024-02-28T06:03:55.885571Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2021-47013",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "b9b17debc69d",
                          "version_value": "c7f75d11fe72"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "status": "affected",
                                "version": "4.9"
                              },
                              {
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                                "status": "unaffected",
                                "version": "0",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "4.9.*",
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                                "version": "4.9.269",
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                              },
                              {
                                "lessThanOrEqual": "4.14.*",
                                "status": "unaffected",
                                "version": "4.14.233",
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                              {
                                "lessThanOrEqual": "4.19.*",
                                "status": "unaffected",
                                "version": "4.19.191",
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                              },
                              {
                                "lessThanOrEqual": "5.4.*",
                                "status": "unaffected",
                                "version": "5.4.119",
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                              {
                                "lessThanOrEqual": "5.10.*",
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                                "version": "5.12.4",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "5.13",
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            "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."
          }
        ]
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                "value": "n/a"
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      },
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            "refsource": "MISC",
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            "url": "https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d"
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            "name": "https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "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."
          }
        ],
        "id": "CVE-2021-47013",
        "lastModified": "2024-02-28T14:06:45.783",
        "metrics": {},
        "published": "2024-02-28T09:15:38.800",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d"
          },
          {
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            "url": "https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}


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