{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-68806",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-68806"
  ],
  "published": "2026-01-13T15:29:33Z",
  "summary": "ksmbd: fix buffer validation by including null terminator size in EA length",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix buffer validation by including null terminator size in EA length\n\nThe smb2_set_ea function, which handles Extended Attributes (EA),\nwas performing buffer validation checks that incorrectly omitted the size\nof the null terminating character (+1 byte) for EA Name.\nThis patch fixes the issue by explicitly adding '+ 1' to EaNameLength where\nthe null terminator is expected to be present in the buffer, ensuring\nthe validation accurately reflects the total required buffer size.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2025-68806"
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      "url": "https://git.kernel.org/stable/c/cae52c592a07e1d3fa3338a5f064a374a5f26750"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
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      "scenario": "AV:N - The flaw is reachable by a remote SMB2/3 client through ksmbd's SMB2 SET_INFO handler over TCP, normally port 445.\nAC:L - The client directly controls the EA lengths and contents, so one deterministic malformed request triggers the over-read without a race or an external condition.\nPR:N - Ksmbd supports passwordless guest sessions on guest-writable shares, where a remote client can obtain FILE_WRITE_EA access. Under the required highest-severity reasonable deployment, no prior privileges are needed.\nUI:N - The attacker can send the necessary SET_INFO and QUERY_INFO requests without any victim action.\nS:U - The disclosure affects the ksmbd host kernel and does not cross a separate virtualization, sandbox, or IOMMU security authority.\nC:H - The malformed EA stores an uninitialized receive-buffer byte in a user xattr that the client can query. Repeated requests with heap grooming can slowly disclose kernel heap contents, warranting high confidentiality impact under conservative scoring.\nI:N - The flaw does not corrupt kernel memory or provide a kernel write primitive; it only changes a user xattr that the client is already authorized to set.\nA:N - The receive allocation includes an extra tail byte, so the faulty copy reads uninitialized in-allocation data rather than faulting; no crash, hang, or resource exhaustion results."
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}