{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38488",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-38488"
  ],
  "published": "2025-07-28T11:22:31Z",
  "summary": "smb: client: fix use-after-free in crypt_message when using async crypto",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix use-after-free in crypt_message when using async crypto\n\nThe CVE-2024-50047 fix removed asynchronous crypto handling from\ncrypt_message(), assuming all crypto operations are synchronous.\nHowever, when hardware crypto accelerators are used, this can cause\nuse-after-free crashes:\n\n  crypt_message()\n    // Allocate the creq buffer containing the req\n    creq = smb2_get_aead_req(..., &req);\n\n    // Async encryption returns -EINPROGRESS immediately\n    rc = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req);\n\n    // Free creq while async operation is still in progress\n    kvfree_sensitive(creq, ...);\n\nHardware crypto modules often implement async AEAD operations for\nperformance. When crypto_aead_encrypt/decrypt() returns -EINPROGRESS,\nthe operation completes asynchronously. Without crypto_wait_req(),\nthe function immediately frees the request buffer, leading to crashes\nwhen the driver later accesses the freed memory.\n\nThis results in a use-after-free condition when the hardware crypto\ndriver later accesses the freed request structure, leading to kernel\ncrashes with NULL pointer dereferences.\n\nThe issue occurs because crypto_alloc_aead() with mask=0 doesn't\nguarantee synchronous operation. Even without CRYPTO_ALG_ASYNC in\nthe mask, async implementations can be selected.\n\nFix by restoring the async crypto handling:\n- DECLARE_CRYPTO_WAIT(wait) for completion tracking\n- aead_request_set_callback() for async completion notification\n- crypto_wait_req() to wait for operation completion\n\nThis ensures the request buffer isn't freed until the crypto operation\ncompletes, whether synchronous or asynchronous, while preserving the\nCVE-2024-50047 fix.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38488"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5d047b12f86cc3b9fde1171c02d9bccf4dba0632"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6550b2bef095d0dd2d2c8390d2ea4c3837028833"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9a1d3e8d40f151c2d5a5f40c410e6e433f62f438"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/15a0a5de49507062bc3be4014a403d8cea5533de"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2a76bc2b24ed889a689fb1c9015307bf16aafb5b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8ac90f6824fc44d2e55a82503ddfc95defb19ae0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b220bed63330c0e1733dc06ea8e75d5b9962b6b6"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
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}