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

{
  "id": "100fb55a4ffcd9b886dac0a53a878f50c36274235baa42f254450b7b35667080",
  "url": "https://osv.dev/vulnerability/CVE-2025-68352",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "spi: ch341: fix out-of-bounds memory access in ch341_transfer_one",
    "summary": "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.",
    "evidence": "osv:CVE-2025-68352",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.12.63",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.17.13",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.2",
            "evidence": "/affected/1/ranges"
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    "severity": "high",
    "structured": {
      "id": "CVE-2025-68352",
      "aliases": [
        "CVE-2025-68352"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
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              "type": "ECOSYSTEM",
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:45.889365464Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/545d1287e40a55242f6ab68bcc1ba3b74088b1bc",
        "https://git.kernel.org/stable/c/81841da1f30f66a850cc8796d99ba330aad9d696",
        "https://git.kernel.org/stable/c/cad6c0fd6f3c0e76a1f75df4bce3b08a13f08974",
        "https://git.kernel.org/stable/c/ea1e43966cd03098fcd5f0d72e6c2901d45fa08d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68352.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-68352",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68352.json"
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    },
    "related_cves": [
      {
        "value": "CVE-2025-68352",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513962,
  "published_at": "2025-12-24T10:32:43.366+00:00"
}