ppp: fix race conditions in ppp_fill_forward_path

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

CVE-2025-39673 · Microsoft / collected KEV context

cve-program · CVE-2025-39673

• https://git.kernel.org/stable/c/9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7
• https://git.kernel.org/stable/c/0f1630be6fcca3f0c63e4b242ad202e5cde28a40
• https://git.kernel.org/stable/c/ca18d751bcc9faf5b7e82e9fae1223d103928181
• https://git.kernel.org/stable/c/94731cc551e29511d85aa8dec61a6c071b1f2430
• https://git.kernel.org/stable/c/f97f6475fdcb3c28ff3c55cc4b7bde632119ec08
• https://git.kernel.org/stable/c/0417adf367a0af11adf7ace849af4638cfb573f7

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