ghsa-3ch6-f277-559q
Vulnerability from github
Published
2024-02-28 09:30
Modified
2024-12-09 18:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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: [
         "CWE-416",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-02-28T09:15:38Z",
      severity: "HIGH",
   },
   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->len by netdev_sent_queue(,skb->len).\n\nAs i observed that emac_tx_fill_tpd() haven't modified the value of skb->len,\nthus my patch assigns skb->len to 'len' before the possible free and\nuse 'len' instead of skb->len later.",
   id: "GHSA-3ch6-f277-559q",
   modified: "2024-12-09T18:31:18Z",
   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: [
      {
         score: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
         type: "CVSS_V3",
      },
   ],
}


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