Siemens RUGGEDCOM RST2428P Improper Input Validation (CVE-2025-40257)

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix a race in mptcppmdeladdtimer mptcppmdeladdtimer can call skstoptimersyncsk, &entry-addtimer while another might have free entry already, as reported by syzbot. Add RCU protection to fix this issue. Also change confusin...