CVE-2026-92506

/// Technical description

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

firmware: arm_scmi: Fix requested device removal race

scmi_protocol_device_unrequest() drops scmi_requested_devices_mtx while

notifying listeners but continues to retain the per-protocol list head.

When two SCMI drivers for the same protocol unregister concurrently, one

thread can remove the final request and free the list head while the other

is running its notifier. The latter then dereferences the freed list head

after reacquiring the mutex and can free it a second time.

Complete the list and IDR updates, including freeing an empty list head,

before dropping the mutex. Keep the blocking notifier outside the critical

section and retain only the detached request across the callback.

/// 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