CVE-2026-90019
UnknownSummary
In the Linux kernel, usb_put_function_instance() attempts to dereference fd inside the fi struct in the uvc_alloc_inst() error path. However, fd is not allocated until later in try_get_usb_function_instance(), so it is guaranteed to be NULL in the error path. The fix adds a NULL check for fi->fd.
Risk Assessment
A NULL pointer dereference in the error path can cause a kernel crash (denial of service) during USB gadget function allocation error handling.
Recommendation
Update the Linux kernel to a version with the fix that adds a NULL check for fi->fd before dereferencing.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: fix null pointer dereference in usb_put_function_instance() usb_put_function_instance() attempts to dereference fd inside fi struct to get mod in uvc_alloc_inst() error path. However, fd is not allocated until later in try_get_usb_function_instance() after allocating fi in uvc_alloc_inst() and thus guranteed to be null in error path. Fix this by adding a null check for fi->fd that returns if fd is null.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS