smb: client: fix reparse buffer bounds in cifs_query_reparse_point()

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix reparse buffer bounds in cifs_query_reparse_point() In cifs_query_reparse_point(), the start >= end check before casting to struct reparse_data_buffer * only ensures the start pointer is within the response. It fails to verify that there is enough space remaining for the fixed 8-byte header of the structure. If a server provides a DataOffset that leaves less than 8 bytes remaining, the check passes, but subsequent reads of ReparseTag and ReparseDataLength will occur out-of-bounds. Fix this by ensuring the remaining space is at least the size of the reparse_data_buffer structure before accessing its fields.

Source published

6 Oct 2026 08:44:13 UTC

Source modified

21 Oct 2026 12:54:47 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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