Linux Kernel lpfc Hard Lockup Vulnerability

A vulnerability in the Linux kernel's lpfc SCSI driver can lead to a system hang, known as a hard lockup. This issue occurs when the driver attempts to log a message with the LOG_TRACE_EVENT, causing the system to freeze. The problem arises because the same CPU tries to acquire a lock twice, leading to a kernel panic. The vulnerability has been addressed by moving the cfg_log_verbose checks before the logging function that causes the lock contention.

Impact

Exploitation of this vulnerability causes a hard lockup, where the system becomes unresponsive due to a kernel panic triggered by a lock contention issue in the lpfc driver.