CVE-2023-53859

A kernel warning vulnerability was found in the s390 architecture idle handling in the Linux kernel. The arch_cpu_idle() function was not marked as noinstr (no instrumentation), causing RCU and tracing warnings when ftrace is enabled. This can trigger kernel warnings and potential issues with tracing in idle paths on s390 systems.

This is an instrumentation marking issue in s390 idle handling that causes kernel warnings. The impact is limited to s390 architecture systems and primarily affects tracing/debugging scenarios.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.