CVE-2026-93091
UnknownSummary
In the Linux kernel's ARM SCMI subsystem, a vulnerability exists where notifications are not quiesced before TX/RX channels are torn down, potentially leading to use-after-free in the notification callback. Additionally, the late-init work may run after the notification instance is freed.
Risk Assessment
The vulnerability could lead to system crashes or potentially arbitrary code execution in kernel context if an attacker can trigger a callback at the right time.
Recommendation
Apply the patch that quiesces notifications before channel teardown and uses disable_work_sync() to synchronize late-init work. Update the kernel to a version containing this fix.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Quiesce notifications before teardown scmi_notification_exit() clears and releases the notification instance, but transport callbacks can still deliver incoming notifications until the TX/RX channels are freed. During remove, an RX interrupt in that window can enter scmi_notify() while notification state is being torn down and then dereference freed memory. The same ordering exists on the probe error path after notification initialization. The notification late-init worker has a separate lifetime issue: protocol event registration queues ni->init_work on the system workqueue, so destroying ni->notify_wq does not drain that work. If the devres group is released while init_work is still pending or running, the late-init worker can dereference the freed notification instance. Quiesce the notification core before TX/RX channels are torn down, then clean up the channels before releasing the notification core resources. Use disable_work_sync() so future late-init queueing is rejected and any already queued or running late-init work has completed before channel teardown starts.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS