CVE-2026-80596: Input: ims-pcu - only expose sysfs attributes on control interface
In the Linux kernel, the following vulnerability has been resolved:
Input: ims-pcu - only expose sysfs attributes on control interface
When the driver was converted to use the driver core to instantiate device attributes (via .devgroups in the usbdriver structure), the attributes started appearing on all interfaces bound to the driver. Since the ims-pcu driver manually claims the secondary data interface during probe, the driver core automatically creates the sysfs attributes for that interface as well.
However, the driver only supports these attributes on the primary control interface. Data interfaces lack the necessary descriptors and internal state to handle these requests, and accessing them can lead to unexpected behavior or crashes.
Fix this by updating the isvisible() callbacks for both the main and OFN attribute groups to verify that the interface being accessed is indeed the control interface.
Affected Software
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
Systems using the Linux kernel ims-pcu USB driver are exposed when the driver binds both its primary control interface and a secondary data interface. The affected sysfs attributes are incorrectly exposed on the secondary data interface.
What action triggers the problem?
Accessing the ims-pcu sysfs attributes through the secondary data interface can trigger unexpected behavior or a crash. Those attributes are supported only on the primary control interface because the data interface lacks the required descriptors and internal state.
How does the fix mitigate the issue?
The fix changes the visibility checks for the main and OFN attribute groups so that the attributes are exposed only when the accessed interface is the control interface.