CVE-2022-49613

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.18

Description The issue arises in the Linux kernel when the console is enabled, and the univ8250 console setup() function calls serial8250 console setup() before the .dev is set to uart port. This results in pm runtime get sync() not being called, leading to a PM usage count warning when univ8250 console exit() is called later. The problem is triggered by the serial8250 register ports() function not calling pm runtime get sync() when the .dev is set for an uart port with console enabled.

Recommendations To fix the issue, call pm runtime get sync() in serial8250 register ports() as soon as .dev is set for an uart port if it has console enabled.