CVE-2025-40122

CVE-2025-40122 relates to the Linux kernel perf_x86/intel PMU and the IA32_PMC_x_CFG_B MSR access error observed on PTL. The issue arises when configuring ACR (auto counter reload) masks via perf events: an incorrect check in intel_pmu_acr_late_setup() lets an invalid ACR counter mask be written ...