{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38561",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38561"
  ],
  "published": "2025-08-19T17:19:12Z",
  "summary": "ksmbd: fix Preauh_HashValue race condition",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix Preauh_HashValue race condition\n\nIf client send multiple session setup requests to ksmbd,\nPreauh_HashValue race condition could happen.\nThere is no need to free sess->Preauh_HashValue at session setup phase.\nIt can be freed together with session at connection termination phase.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38561"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fbf5c0845ed15122a770bca9be1d9b60b470d3aa"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b69fd87076daa66f3d186bd421a7b0ee0cb45829"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/edeecc7871e8fc0878d53ce286c75040a0e38f6c"
    },
    {
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      "url": "https://git.kernel.org/stable/c/7d7c0c5304c88bcbd7a85e9bcd61d27e998ba5fc"
    },
    {
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      "url": "https://git.kernel.org/stable/c/6613887da1d18dd2ecfd6c6148a873c4d903ebdc"
    },
    {
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      "url": "https://git.kernel.org/stable/c/44a3059c4c8cc635a1fb2afd692d0730ca1ba4b6"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445, and the entire path is driven by remote SMB2 SESSION_SETUP PDUs parsed straight off the socket. Internet- and LAN-facing NAS, container, and file-server deployments are directly exposed.\nAC:L - The attacker controls both sides of the race completely \u2014 how many SESSION_SETUP PDUs to pipeline, across how many TCP connections, whether to use multichannel binding to bypass the per-connection mutex entirely, and when to drop the socket to race connection teardown. ksmbd's non-ordered workqueue guarantees parallel processing, and failed attempts cost only a reconnect.\nPR:N - SESSION_SETUP is the authentication handshake itself; the buffer is allocated, hashed, and read on the response path before any credential is verified, and the NtLmNegotiate racer is fully pre-authentication. The guest branch of ntlm_authenticate() skips the NTLM blob check entirely, reaching the vulnerable kfree() with no credentials on the common guest-mapped share configuration.\nUI:N - Exploitation requires only that the attacker connect to the SMB port and send session setup requests. No action by any local user or administrator is needed.\nS:U - The double free and use-after-free corrupt kernel heap memory within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed 64-byte chunk is read back via sha512_update() and, decisively, serves as the KDF context for the SMB 3.1.1 signing and encryption keys \u2014 reclaiming it with chosen content yields attacker-known session keys and decryption of other clients' traffic. The double free of a general-purpose kmalloc-64 object is also a standard route to a full arbitrary-read primitive.\nI:H - This is a double free of a kmalloc-64 object plus a 64-byte out-of-lifetime write (sha512_final into the freed buffer) that clobbers whatever victim object reclaimed the slot, giving the classic heap-grooming path to arbitrary write and control-flow hijack. It additionally enables forging signed SMB messages by controlling the signing-key derivation context.\nA:H - The double free corrupts the SLUB freelist and the use-after-free write smashes reclaimed objects, both of which panic the kernel. The racing NULL store also reaches ksmbd_gen_smb311_encryptionkey()/ksmbd_gen_smb311_signingkey(), which dereference sess->Preauth_HashValue with no NULL check, for a trivially repeatable remote oops."
    }
  }
}