smb: client: split cached_fid bitfields to avoid shared-byte RMW races

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-23230 · Microsoft / collected KEV context

cve-program · CVE-2026-23230

• https://git.kernel.org/stable/c/569fecc56bfe4df66f05734d67daef887746656b
• https://git.kernel.org/stable/c/4386f6af8aaedd0c5ad6f659b40cadcc8f423828
• https://git.kernel.org/stable/c/3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a
• https://git.kernel.org/stable/c/c4b9edd55987384a1f201d3d07ff71e448d79c1b
• https://git.kernel.org/stable/c/4cfa4c37dcbcfd70866e856200ed8a2894cac578
• https://git.kernel.org/stable/c/ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241

No related operational record is retained in the current change model.