{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31478",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31478"
  ],
  "published": "2026-04-22T13:57:42Z",
  "summary": "ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()\n\nAfter this commit (e2b76ab8b5c9 \"ksmbd: add support for read compound\"),\nresponse buffer management was changed to use dynamic iov array.\nIn the new design, smb2_calc_max_out_buf_len() expects the second\nargument (hdr2_len) to be the offset of ->Buffer field in the\nresponse structure, not a hardcoded magic number.\nFix the remaining call sites to use the correct offsetof() value.",
  "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-2026-31478"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361"
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      "url": "https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5"
    },
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      "url": "https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683"
    },
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      "url": "https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d"
    },
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      "url": "https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1"
    },
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    },
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  "database_specific": {
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The vulnerable code is in ksmbd SMB2 request handling reachable over TCP SMB connections, including normal network-facing port 445 deployments.\nAC:L - An attacker controls the SMB2 compound request layout, output buffer lengths, and command sequence needed to reach the miscalculation; no race or external timing condition is required.\nPR:N - The handlers run after SMB session/tree setup, but ksmbd supports guest/anonymous sessions and guest shares, so a reasonable deployment allows a remote attacker to reach the path without credentials.\nUI:N - No victim action is required after the ksmbd service is exposed; the attacker sends crafted SMB2 requests directly.\nS:U - The impact remains within the kernel/ksmbd security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The bug can cause out-of-bounds kernel response-buffer memory corruption in compound SMB2 handling, which is defensibly treatable as exploitable memory corruption with potential information disclosure.\nI:H - The incorrect length calculation can permit an out-of-bounds write past the ksmbd response buffer, and kernel OOB writes are scored as high integrity impact.\nA:H - Even if not weaponized for code execution, the out-of-bounds kernel write can crash or oops the kernel, causing high availability impact."
    }
  }
}