CVE-2026-93081
UnknownSummary
In the Linux kernel, the arm_scmi firmware driver has a device lifetime management flaw. scmi_child_dev_find() drops the reference returned by device_find_child() before returning the scmi_device pointer, so a concurrent unregister can release the device while the destroy path still uses the returned pointer. Additionally, the SCMI bus ID may be reused before the old sysfs entry is removed.
Risk Assessment
This can lead to a use-after-free and kernel crash or data corruption. Environments that dynamically add and remove SCMI devices are at real risk.
Recommendation
Update the Linux kernel to a version containing the fix for this CVE. If updating is not possible, limit dynamic operations on SCMI devices.
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Original NVD description (English source)
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 and final-release paths, and clear scmi_dev->id after freeing it so the final release cannot free the same ID again.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS