CVE-2026-93084
UnknownSummary
In the Linux kernel's ARM SCMI subsystem, a vulnerability exists where on protocol bind failure, the SCMI handle is not released, leading to reference leaks and leaving an inconsistent state. This also applies when device_link_add() fails.
Risk Assessment
The vulnerability could lead to resource exhaustion or unpredictable behavior during device unbinding, potentially enabling a DoS attack.
Recommendation
Apply the patch that drops the handle on bind failure and handles BUS_NOTIFY_DRIVER_NOT_BOUND. 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: Drop handle on protocol bind failures The SCMI bus notifier acquires an SCMI handle when the driver core emits BUS_NOTIFY_BIND_DRIVER, before invoking the protocol driver probe callback. The protocol probe path only checks whether sdev->handle is set. If device_link_add() fails after the handle has been acquired, the protocol device can still bind with a valid handle but without the dependency link to the SCMI parent. A concurrent parent unbind can then miss the child and tear down the SCMI instance while the child still holds a handle into it. If the protocol driver probe later fails, for example with -EPROBE_DEFER, the driver core emits BUS_NOTIFY_DRIVER_NOT_BOUND rather than BUS_NOTIFY_UNBOUND_DRIVER. The SCMI notifier only released the handle on BUS_NOTIFY_UNBOUND_DRIVER, so each failed protocol-device bind leaked the SCMI instance users refcount and left sdev->handle set after the failed probe. Make the link helper report failure and drop the acquired handle if the link cannot be created. Also handle BUS_NOTIFY_DRIVER_NOT_BOUND in the same cleanup path used for unbind so failed probes balance the earlier BUS_NOTIFY_BIND_DRIVER acquisition.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS