CVE-2026-72069: In the Linux kernel, the following vulnerability has been resolved: locking/rt: Fix the incorrect RCU protection in rt_

A vulnerability in the Linux kernel's real-time spinlock code allowed a use-after-free (UAF, accessing memory after it has been freed) because rt_spin_unlock() was releasing RCU protection (a mechanism that prevents memory from being freed during critical sections) too early. The fix moves the rcu_read_unlock() call to happen after the unlock operation completes, matching how regular spinlocks protect memory and preventing the window where freed memory could be accessed.