CVE-2026-90019

Description

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.

References

• https://git.kernel.org/stable/c/0fc54a00954f9f4c3e3d4ffa64a530685d99a39b
• https://git.kernel.org/stable/c/3a9691fff79bcce95338435599df6d3ae433cfdc
• https://git.kernel.org/stable/c/5117f236e9e30744338b425395d55913c4500897
• https://git.kernel.org/stable/c/6e6736c049683380f5e20becde498986e9293ca4
• https://git.kernel.org/stable/c/6e74ac5c596fd246e37eadfc354567179ccbe9aa