CVE-2023-53859

CVE-2023-53859 is a Linux kernel issue affecting the s390 idle path where arch_cpu_idle() was not marked noinstr, triggering an RCU-related warning during idle tracing. The affected sequence shows a warning: “RCU not on for: arch_cpu_idle+0x0/0x28” in arch_ftrace_ops_list_func, leading to a trace...