CVE-2022-50767 fbdev: smscufx: Fix several use-after-free bugs
A use-after-free vulnerability in the Linux kernel smscufx driver allows local attackers to execute arbitrary code or escalate privileges by physically removing a USB device.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2022-50767?
CVE-2022-50767 is an use after free vulnerability in Linux, published on 24 Dec 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In the Linux kernel, the following vulnerability has been resolved:
fbdev: smscufx: Fix several use-after-free bugs
Several types of UAFs can occur when physically removing a USB device.
Adds ufx_ops_destroy() function to .fb_destroy of fb_ops, and in this function, there is kref_put() that finally calls ufx_free().
This fix prevents multiple UAFs.
Which versions are affected by CVE-2022-50767?
How do I fix CVE-2022-50767?
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-2022-50767 being exploited?
There is no known exploitation of CVE-2022-50767 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50767, GHSA-gvc9-3fj4-7qr5, UBUNTU-CVE-2022-50767.