CVE-2026-92492

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

cpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks

cpufreq_cpu_get() returns NULL when no cpufreq policy is associated with

the requested CPU, for example because the CPU is offline or the policy

has already been torn down. Both amd_pstate_power_supply_notifier() and

amd_pstate_profile_set() acquire a policy via cpufreq_cpu_get() and then

pass that pointer to amd_pstate_get_balanced_epp() and

amd_pstate_set_epp(), which dereference it unconditionally. A racing

CPU hotplug or driver teardown can therefore lead to a NULL pointer

dereference on either of these dynamic EPP paths.

The third cpufreq_cpu_get() caller in this file, amd_pstate_verify(),

already handles the NULL case. Bring the two new callers in line with

that pattern: return NOTIFY_OK from the power-supply notifier (matching

the other "nothing to do" exits) and -ENODEV from amd_pstate_profile_set()

(the usual cpufreq error for a missing C

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References