CVE-2026-93081

/// Technical description

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

firmware: arm_scmi: Fix SCMI device destroy lifetimes

scmi_child_dev_find() drops the reference returned by

device_find_child() before returning the scmi_device pointer. A

concurrent unregister can then release the device while the destroy path

is still using the returned pointer.

Make the lookup helper return the device_find_child() reference and keep

it until scmi_device_destroy() has finished unregistering the child.

Also split device_unregister() in __scmi_device_destroy() so the SCMI bus

ID is not made reusable until after device_del() has removed the old

scmi_dev.N name from sysfs. This avoids a new SCMI device reusing the

same ID while the old device is still registered.

The final device release callback is also a possible cleanup path when

SCMI children are deleted by driver core recursion rather than

__scmi_device_destroy(). Release the SCMI bus ID from a common helper

used by destroy, register-failure an

/// 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