CVE-2025-71119

A warning condition was found in the Linux kernel's PowerPC kexec implementation. When SMT (Simultaneous Multi-Threading) is disabled or partially enabled, attempting to kexec into a new kernel triggers warnings because the kexec code tries to wake offline CPUs that fail the cpu_smt_thread_allowed() check. The add_cpu() call fails for non-primary threads when SMT is disabled, causing kernel warnings during the reboot process.

This issue affects PowerPC systems using kexec when SMT is not fully enabled. The warning occurs during the kexec reboot sequence but does not prevent the kexec from completing. The impact is limited to kernel warnings in the log rather than a functional failure. This primarily affects enterprise PowerPC servers with many CPU cores.

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.