Service interruption via mismatched BPF freplace attachment

Improper BPF attachment in Linux Kernel 6.18 through 6.18.32 and 6.19 through 7.0.9 allows local users to interrupt service. The BPF attachment path in kernel/bpf/syscall.c permits a freplace program with writable kprobe context to target a kprobe program with a different kprobe_write_ctx setting, allowing modification of pt_regs. Exploitation requires local low-privileged access and permission to load and attach the involved BPF programs, and can force a kernel function's first argument to zero.