CVE-2025-40122

A flaw was found in the Linux kernel’s perf subsystem.In intel_pmu_acr_late_setup(), the validation of the Auto Counter Reload (ACR) counter mask passed from user-space was incorrect: the code used i + idx > cpuc->n_events instead of >=, which could lead to an invalid bit being set in hw.config1 and written into MSR IA32_PMC_x_CFG_B, triggering unchecked MSR access errors.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.