{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64398",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64398"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "ksmbd: add a permission check for FSCTL_SET_ZERO_DATA",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: add a permission check for FSCTL_SET_ZERO_DATA\n\nFSCTL_SET_ZERO_DATA in smb2_ioctl() destroys file data via\nksmbd_vfs_zero_data() -> vfs_fallocate(PUNCH_HOLE/ZERO_RANGE) after\nchecking only the share-level KSMBD_TREE_CONN_FLAG_WRITABLE, with no\nper-handle access check. A handle opened with only FILE_WRITE_ATTRIBUTES\nstill yields an FMODE_WRITE filp (FILE_WRITE_ATTRIBUTES is part of\nFILE_WRITE_DESIRE_ACCESS_LE, so smb2_create_open_flags() opens it\nO_WRONLY), so the vfs_fallocate FMODE_WRITE check does not stop it; only\nthe missing fp->daccess gate would. Reproduced on mainline 7.1-rc7 with\nKASAN by an authenticated SMB client: a FILE_WRITE_ATTRIBUTES-only handle\nzeroed 4096 bytes of file data it had no FILE_WRITE_DATA right to\n(6/6; a FILE_READ_DATA-only handle was correctly denied).\n\nThis is the unfixed sibling of commit cc57232cae23 (\"ksmbd: fix FSCTL\npermission bypass by adding a permission check for FSCTL_SET_SPARSE\").\nBecause SET_ZERO_DATA writes data (not an attribute), require\nFILE_WRITE_DATA.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
    }
  ],
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      "cvss_v3_score": 8.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The vulnerable ksmbd handler processes SMB2 IOCTL requests received remotely over SMB on TCP port 445.\nAC:L - An attacker can deterministically open a metadata-only handle and submit one or more SET_ZERO_DATA requests with attacker-controlled ranges; no race or uncontrollable condition is required.\nPR:L - The path requires a valid SMB session, access to a writable share, and permission to open the target with FILE_WRITE_ATTRIBUTES, but it does not require administrative privileges.\nUI:N - Exploitation occurs entirely through attacker-generated SMB requests and requires no victim action.\nS:U - The flaw corrupts files managed by the same ksmbd host and does not cross a VM, sandbox, or other security-authority boundary.\nC:N - The operation only zeros or deallocates file ranges; it provides no data-read primitive, information disclosure, or kernel-memory corruption.\nI:H - The attacker can persistently zero arbitrary selected ranges, including an entire file, despite lacking FILE_WRITE_DATA permission; SET_ZERO_DATA is explicitly a file-content modification operation ([Microsoft MS-FSCC](https://learn.microsoft.com/en-us/openspecs/windows_protoco ls/ms-fscc/6be5164f-3eb6-4149-b997-c37df1444779)).\nA:H - Repeatedly erasing critical databases, configurations, firmware images, or application data on an SMB share can cause complete and persistent service or resource unavailability until restoration."
    }
  }
}