CVE-2025-39681

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper<br /> <br /> Since<br /> <br /> 923f3a2b48bd ("x86/resctrl: Query LLC monitoring properties once during boot")<br /> <br /> resctrl_cpu_detect() has been moved from common CPU initialization code to<br /> the vendor-specific BSP init helper, while Hygon didn&amp;#39;t put that call in their<br /> code.<br /> <br /> This triggers a division by zero fault during early booting stage on our<br /> machines with X86_FEATURE_CQM* supported, where get_rdt_mon_resources() tries<br /> to calculate mon_l3_config with uninitialized boot_cpu_data.x86_cache_occ_scale.<br /> <br /> Add the missing resctrl_cpu_detect() in the Hygon BSP init helper.<br /> <br /> [ bp: Massage commit message. ]