bpf: sync_linked_regs() must preserve subreg_def

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

CVE-2024-53125 · Microsoft / collected KEV context

cve-program · CVE-2024-53125

• https://git.kernel.org/stable/c/dadf82c1b2608727bcc306843b540cd7414055a7
• https://git.kernel.org/stable/c/b57ac2d92c1f565743f6890a5b9cf317ed856b09
• https://git.kernel.org/stable/c/60fd3538d2a8fd44c41d25088c0ece3e1fd30659
• https://git.kernel.org/stable/c/bfe9446ea1d95f6cb7848da19dfd58d2eec6fd84
• https://git.kernel.org/stable/c/e2ef0f317a52e678fe8fa84b94d6a15b466d6ff0
• https://git.kernel.org/stable/c/e9bd9c498cb0f5843996dbe5cbce7a1836a83c70

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