{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38737",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38737"
  ],
  "published": "2025-09-05T17:22:05Z",
  "summary": "cifs: Fix oops due to uninitialised variable",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix oops due to uninitialised variable\n\nFix smb3_init_transform_rq() to initialise buffer to NULL before calling\nnetfs_alloc_folioq_buffer() as netfs assumes it can append to the buffer it\nis given.  Setting it to NULL means it should start a fresh buffer, but the\nvalue is currently undefined.",
  "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-2025-38737"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4931fe2dbe1cc0e7d350a4b51b0b330e43971d98"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6adaa9fae36f848afa7278945d725e197e33c496"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/453a6d2a68e54a483d67233c6e1e24c4095ee4be"
    }
  ],
  "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 - The vulnerable path is the SMB3 client transport-encryption routine, and whether it is entered is dictated by server-supplied SESSION_SETUP/TREE_CONNECT flags (SMB2_SESSION_FLAG_ENCRYPT_DATA / SHI1005_FLAGS_ENCRYPT_DATA), so a remote or MITM SMB server across the network selects the vulnerable path and receives the leaked plaintext of the corrupted buffer.\nAC:L - Once encryption is negotiated, every write with a payload runs the uninitialised pointer through netfs_alloc_folioq_buffer(); the stack slot is reachable and groomable via ordinary syscall sequences on the writing task's kernel stack, with no condition outside the attacker's influence.\nPR:N - The remote SMB server presents no credentials to the client and needs none to set the encryption flags that gate the path; on the local side, any user holding a normal write handle to the mounted share triggers it with no elevated privileges.\nUI:N - An already-mounted share reaches the path through routine writeback and automatic reconnect (which re-runs session setup and tree connect), so no victim action beyond normal use of an existing mount is required.\nS:U - The wild reads, writes and bogus folio_put()s all occur within the kernel's own memory and the same security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - Because *_buffer is never reassigned, the garbage folio_queue is used as the ITER_SOURCE for crypt_message(), so arbitrary kernel memory pointed to by the stale chain is encrypted and sent to the remote peer, and freeing the chain yields further use-after-free read primitives.\nI:H - netfs_alloc_folioq_buffer() writes through the garbage pointer (tail->next = p, p->prev = tail, folioq_append_mark()), and cifs_copy_iter_to_folioq() then copies attacker-supplied write() data into folios derived from that chain, giving a content-controlled kernel write suitable for control-flow hijacking.\nA:H - The commit is titled \"Fix oops due to uninitialised variable\" \u2014 dereferencing the indeterminate pointer oopses the kernel, and the resulting folio_queue/folio refcount corruption and bogus frees cause further panics."
    }
  }
}