{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-52944",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-52944"
  ],
  "published": "2026-06-24T09:58:10Z",
  "summary": "ksmbd: fix FSCTL permission bypass by adding a permission check for FSCTL_SET_SPARSE",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix FSCTL permission bypass by adding a permission check for FSCTL_SET_SPARSE\n\nFSCTL_SET_SPARSE in fsctl_set_sparse() modifies the file's sparse\nattribute and saves it through xattr without any permission checks.\n\nThis exposes two issues:\n\n1) A client on a read-only share can change the sparse attribute\n   on files it opened, even though the share is read-only.\n   Other FSCTL write operations already check\n   test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE),\n   but FSCTL_SET_SPARSE does not.\n\n2) Even on writable shares, clients without FILE_WRITE_DATA or\n   FILE_WRITE_ATTRIBUTES access should not modify the sparse\n   attribute. Similar handle-level checks exist in other functions\n   but are missing here.\n\nAdd both share-level writable check and per-handle access check.\nUse goto out on error to avoid leaking file references.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-52944"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ef664475c1bf1a27d45dae6848ca9c9c4d86853f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3a9a0a1c38ef90788f5d7c4b29903c8b220f744a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3127a884525dc8ca4def73254bfcd3ccef0bf812"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c5ab11263e3c89aa7989afc5374ef7743e092fd0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/de9eb0b44fa9123170e6245b49638e0e453c10f8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aef151bcfa494bfe983669de2726734b534adb73"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cc57232cae23c0df91b4a59d0f519141ce9b5b02"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z"
  }
}