{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-52996",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-52996"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "ksmbd: fix durable fd leak on ClientGUID mismatch in durable v2 open",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix durable fd leak on ClientGUID mismatch in durable v2 open\n\nksmbd_lookup_fd_cguid() returns a ksmbd_file with its refcount\nincremented via ksmbd_fp_get(). parse_durable_handle_context() in\nthe DURABLE_REQ_V2 case properly releases this reference on every\npath inside the ClientGUID-match branch, either by calling\nksmbd_put_durable_fd() or by transferring ownership to dh_info->fp\nfor a successful reconnect. However, when an entry exists in the\nglobal file table with the same CreateGuid but a different\nClientGUID, the code simply falls through to the new-open path\nwithout dropping the reference obtained from ksmbd_lookup_fd_cguid().\n\nPer MS-SMB2 section 3.3.5.9.10 (\"Handling the\nSMB2_CREATE_DURABLE_HANDLE_REQUEST_V2 Create Context\"), the server\nMUST locate an Open whose Open.CreateGuid matches the request's\nCreateGuid AND whose Open.ClientGuid matches the ClientGuid of the\nconnection that received the request. If no such Open is found, the\nserver MUST continue with the normal open execution phase. A\nCreateGuid hit with a ClientGUID mismatch is therefore the\n\"Open not found\" case: proceeding with a new open is correct, but\nthe reference obtained purely as a side effect of the lookup must\nnot be leaked.\n\nRepeated requests that hit this mismatch pin global_ft entries,\nprevent __ksmbd_close_fd() from ever running for the corresponding\nfiles, and defeat the durable scavenger, leading to long-lived\nresource leaks.\n\nRelease the reference in the mismatch path and clear dh_info->fp so\nsubsequent logic does not mistake a non-matching lookup result for\na reconnect target.",
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