CVE-2026-89733 usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()
A use-after-free vulnerability in the Linux kernel's USB gadget UVC driver allows attackers to potentially execute code or escalate privileges via dangling pointers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89733?
CVE-2026-89733 is a high-severity use after free vulnerability in Linux, published on 11 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: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()
In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind().
Which versions are affected by CVE-2026-89733?
How do I fix CVE-2026-89733?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-89733 being exploited?
There is no known exploitation of CVE-2026-89733 in the wild and no public exploit code.
Sources
Also known as AZL-100431, BELL-CVE-2026-89733, DEBIAN-CVE-2026-89733, GHSA-p2g2-5xg5-fj3w, UBUNTU-CVE-2026-89733.