CVE-2026-90019 usb: gadget: fix null pointer dereference in usb_put_function_instance()
A null pointer dereference in the Linux kernel USB gadget driver allows local attackers to cause a system crash via the UVC function instance error path.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90019?
CVE-2026-90019 is a vulnerability in Linux, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-90019?
How do I fix CVE-2026-90019?
Apply the vendor's patch.
Is CVE-2026-90019 being exploited?
There is no known exploitation of CVE-2026-90019 in the wild and no public exploit code.
Sources
Also known as AZL-101324, BELL-CVE-2026-90019, DEBIAN-CVE-2026-90019, GHSA-gprv-q9q2-hpx6, UBUNTU-CVE-2026-90019.