{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31433",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31433"
  ],
  "published": "2026-04-22T08:17:36Z",
  "summary": "ksmbd: fix potencial OOB in get_file_all_info() for compound requests",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix potencial OOB in get_file_all_info() for compound requests\n\nWhen a compound request consists of QUERY_DIRECTORY + QUERY_INFO\n(FILE_ALL_INFORMATION) and the first command consumes nearly the entire\nmax_trans_size, get_file_all_info() would blindly call smbConvertToUTF16()\nwith PATH_MAX, causing out-of-bounds write beyond the response buffer.\nIn get_file_all_info(), there was a missing validation check for\nthe client-provided OutputBufferLength before copying the filename into\nFileName field of the smb2_file_all_info structure.\nIf the filename length exceeds the available buffer space, it could lead to\npotential buffer overflows or memory corruption during smbConvertToUTF16\nconversion. This calculating the actual free buffer size using\nsmb2_calc_max_out_buf_len() and returning -EINVAL if the buffer is\ninsufficient and updating smbConvertToUTF16 to use the actual filename\nlength (clamped by PATH_MAX) to ensure a safe copy operation.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/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-2026-31433"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - ksmbd is the in-kernel SMB server listening on TCP port 445, directly reachable over the network by any SMB client.\nAC:L - The attacker can reliably construct a compound request (QUERY_DIRECTORY + QUERY_INFO) where the first command consumes most of the buffer, then trigger the OOB write in the second command with no race conditions or special prerequisites.\nPR:L - The vulnerability requires an authenticated SMB session and tree connection; smb2_check_user_session() and smb2_get_ksmbd_tcon() are enforced before QUERY_INFO is processed, so the attacker needs valid SMB credentials.\nUI:N - No user interaction is required; the attacker sends the malicious compound SMB request directly over the network.\nS:U - The vulnerability stays within the kernel security scope; there is no crossing of a security boundary like VM escape or sandbox escape.\nC:H - The out-of-bounds heap write of up to ~8KB of attacker-influenced data into kernel heap can be leveraged to corrupt adjacent objects and create read primitives for arbitrary kernel memory disclosure.\nI:H - The OOB heap write corrupts adjacent kernel heap objects with partially attacker-controlled data (UTF-16 filename), which can be exploited via heap shaping for arbitrary write primitives and code execution.\nA:H - The out-of-bounds write corrupts kernel heap memory, which will reliably cause kernel crashes or panics."
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}