ghsa-3cw8-5h35-w527
Vulnerability from github
Published
2025-12-24 12:30
Modified
2025-12-24 12:30
Details

In the Linux kernel, the following vulnerability has been resolved:

spi: ch341: fix out-of-bounds memory access in ch341_transfer_one

Discovered by Atuin - Automated Vulnerability Discovery Engine.

The 'len' variable is calculated as 'min(32, trans->len + 1)', which includes the 1-byte command header.

When copying data from 'trans->tx_buf' to 'ch341->tx_buf + 1', using 'len' as the length is incorrect because:

  1. It causes an out-of-bounds read from 'trans->tx_buf' (which has size 'trans->len', i.e., 'len - 1' in this context).
  2. It can cause an out-of-bounds write to 'ch341->tx_buf' if 'len' is CH341_PACKET_LENGTH (32). Writing 32 bytes to ch341->tx_buf + 1 overflows the buffer.

Fix this by copying 'len - 1' bytes.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68352"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-24T11:15:58Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: ch341: fix out-of-bounds memory access in ch341_transfer_one\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine.\n\nThe \u0027len\u0027 variable is calculated as \u0027min(32, trans-\u003elen + 1)\u0027,\nwhich includes the 1-byte command header.\n\nWhen copying data from \u0027trans-\u003etx_buf\u0027 to \u0027ch341-\u003etx_buf + 1\u0027, using \u0027len\u0027\nas the length is incorrect because:\n\n1. It causes an out-of-bounds read from \u0027trans-\u003etx_buf\u0027 (which has size\n   \u0027trans-\u003elen\u0027, i.e., \u0027len - 1\u0027 in this context).\n2. It can cause an out-of-bounds write to \u0027ch341-\u003etx_buf\u0027 if \u0027len\u0027 is\n   CH341_PACKET_LENGTH (32). Writing 32 bytes to ch341-\u003etx_buf + 1\n   overflows the buffer.\n\nFix this by copying \u0027len - 1\u0027 bytes.",
  "id": "GHSA-3cw8-5h35-w527",
  "modified": "2025-12-24T12:30:29Z",
  "published": "2025-12-24T12:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68352"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/545d1287e40a55242f6ab68bcc1ba3b74088b1bc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81841da1f30f66a850cc8796d99ba330aad9d696"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cad6c0fd6f3c0e76a1f75df4bce3b08a13f08974"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea1e43966cd03098fcd5f0d72e6c2901d45fa08d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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