CVE-2025-39681

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 923f3a2b48bd

Description A division by zero fault can occur during the early booting stage on machines with X86 FEATURE CQM* supported. This is due to get rdt mon resources() attempting to calculate mon l3 config with an uninitialized boot cpu data.x86 cache occ scale. The issue arises because resctrl cpu detect() was moved to a vendor-specific BSP init helper but was not implemented in Hygon’s code.

Recommendations Update the Linux kernel to a version after commit 923f3a2b48bd.