CVE-2026-80727

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 7.2.0-rc5

Description An issue exists in the x86 Machine Check Exception (MCE) implementation where the CMCI storm detection attempts to modify a polling timer before it has been properly initialized. This sequence can lead to system warnings and instability during the boot process. The problem occurs when the cmci discover() function is called via intel init cmci() and mce intel feature init(), triggering mce timer kick() and mod timer() before the timer is set up by mcheck cpu setup timer().

Recommendations Update the Linux kernel to version 7.2.0-rc5 or later.