{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40320",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40320"
  ],
  "published": "2025-12-08T00:47:38Z",
  "summary": "smb: client: fix potential cfid UAF in smb2_query_info_compound",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential cfid UAF in smb2_query_info_compound\n\nWhen smb2_query_info_compound() retries, a previously allocated cfid may\nhave been freed in the first attempt.\nBecause cfid wasn't reset on replay, later cleanup could act on a stale\npointer, leading to a potential use-after-free.\n\nReinitialize cfid to NULL under the replay label.\n\nExample trace (trimmed):\n\nrefcount_t: underflow; use-after-free.\nWARNING: CPU: 1 PID: 11224 at ../lib/refcount.c:28 refcount_warn_saturate+0x9c/0x110\n[...]\nRIP: 0010:refcount_warn_saturate+0x9c/0x110\n[...]\nCall Trace:\n <TASK>\n smb2_query_info_compound+0x29c/0x5c0 [cifs f90b72658819bd21c94769b6a652029a07a7172f]\n ? step_into+0x10d/0x690\n ? __legitimize_path+0x28/0x60\n smb2_queryfs+0x6a/0xf0 [cifs f90b72658819bd21c94769b6a652029a07a7172f]\n smb311_queryfs+0x12d/0x140 [cifs f90b72658819bd21c94769b6a652029a07a7172f]\n ? kmem_cache_alloc+0x18a/0x340\n ? getname_flags+0x46/0x1e0\n cifs_statfs+0x9f/0x2b0 [cifs f90b72658819bd21c94769b6a652029a07a7172f]\n statfs_by_dentry+0x67/0x90\n vfs_statfs+0x16/0xd0\n user_statfs+0x54/0xa0\n __do_sys_statfs+0x20/0x50\n do_syscall_64+0x58/0x80",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40320"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/939c4e33005e2a56ea8fcedddf0da92df864bd3b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/327f89c21601ebb7889f8c97754b76f08ce95a0c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b556c278d43f4707a9073ca74d55581b4f279806"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5c76f9961c170552c1d07c830b5e145475151600"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}