CVE-2026-90019

A flaw was found in the Linux kernel. A null pointer dereference can occur in the usb_put_function_instance() function within the USB gadget subsystem. This issue arises because a file descriptor (fd) is not allocated before being dereferenced in an error path, which can lead to a system crash. A local attacker could exploit this vulnerability to cause a Denial of Service (DoS).

This vulnerability is rated as Low severity because triggering the issue requires local privileges to configure USB gadget devices, a subsystem that is not active or utilized in standard enterprise deployments. In Red Hat Enterprise Linux, USB gadget drivers such as UVC are intended for specialized embedded or device-mode hardware and are not exposed during normal server operations. Exploitation is further constrained to specific failure handling paths during instance allocation, restricting the maximum impact to a local system crash.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.