{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-26936",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-26936"
  ],
  "published": "2024-05-01T05:31:05Z",
  "summary": "ksmbd: validate request buffer size in smb2_allocate_rsp_buf()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate request buffer size in smb2_allocate_rsp_buf()\n\nThe response buffer should be allocated in smb2_allocate_rsp_buf\nbefore validating request. But the fields in payload as well as smb2 header\nis used in smb2_allocate_rsp_buf(). This patch add simple buffer size\nvalidation to avoid potencial out-of-bounds in request buffer.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-26936"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8f3d0bf1d0c62b539d54c5b9108a845cff619b99"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/21ff9d7d223c5c19cb4334009e4c0c83a2f4d674"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5c20b242d4fed73a93591e48bfd9772e2322fb11"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/17cf0c2794bdb6f39671265aa18aea5c22ee8c4a"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.2,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The vulnerable code is in ksmbd, the in-kernel SMB server processing requests received on TCP port 445; the OOB read is driven entirely by fields in a remotely supplied SMB2 packet, making it remotely reachable over the network.\nAC:L - A single crafted SMB2 QUERY_INFO / transform request deterministically triggers the field read on an undersized buffer, with no race or unpredictable precondition the attacker cannot control.\nPR:N - In the affected code smb2_allocate_rsp_buf() runs before init_rsp_hdr and before check_user_session, and in the original ordering before decryption/session lookup, so a crafted (transform) request reaches the OOB read pre-authentication\u2014consistent with the paired CVE-2024-26980.\nUI:N - The attacker sends the malformed request directly to the server; no action by any local user or victim is required.\nS:U - The out-of-bounds read stays within the kernel's own memory and security authority; no VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:L - The read goes out of bounds by a couple of bytes (InfoType/FileInfoClass) of adjacent slab memory; it is strictly bounded to a few bytes and feeds only an internal size decision, so limited rather than arbitrary disclosure.\nI:N - The defect is purely an out-of-bounds read used to size the response buffer; there is no out-of-bounds write, freed-object reuse, or type confusion, so no data can be modified.\nA:H - Reading past a small slab allocation into a redzone or unmapped region produces a KASAN-detected slab-out-of-bounds and can oops/panic the kernel, and the request can be repeated at will, yielding a remote denial of service."
    }
  }
}