ghsa-3ch6-f277-559q
Vulnerability from github
Published
2024-02-28 09:30
Modified
2024-02-28 09:30
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.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47013"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-28T09:15:38Z",
    "severity": null
  },
  "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": "GHSA-3ch6-f277-559q",
  "modified": "2024-02-28T09:30:38Z",
  "published": "2024-02-28T09:30:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47013"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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