{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-39917",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-39917"
  ],
  "published": "2025-10-01T07:47:34Z",
  "summary": "bpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt\n\nStanislav reported that in bpf_crypto_crypt() the destination dynptr's\nsize is not validated to be at least as large as the source dynptr's\nsize before calling into the crypto backend with 'len = src_len'. This\ncan result in an OOB write when the destination is smaller than the\nsource.\n\nConcretely, in mentioned function, psrc and pdst are both linear\nbuffers fetched from each dynptr:\n\n  psrc = __bpf_dynptr_data(src, src_len);\n  [...]\n  pdst = __bpf_dynptr_data_rw(dst, dst_len);\n  [...]\n  err = decrypt ?\n        ctx->type->decrypt(ctx->tfm, psrc, pdst, src_len, piv) :\n        ctx->type->encrypt(ctx->tfm, psrc, pdst, src_len, piv);\n\nThe crypto backend expects pdst to be large enough with a src_len length\nthat can be written. Add an additional src_len > dst_len check and bail\nout if it's the case. Note that these kfuncs are accessible under root\nprivileges only.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-39917"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0126358df12d6f476f79251d9c398ac5c1b3062d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c4be24ef0510c146dca4671effb127e97631534b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f9bb6ffa7f5ad0f8ee0f53fc4a10655872ee4a14"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}