CVE-2022-50036 drm/sun4i: dsi: Prevent underflow when computing packet sizes
An integer underflow in the Linux kernel's sun4i DSI driver can cause a wrap-around error, potentially leading to a denial of service.
- 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-2022-50036?
CVE-2022-50036 is a medium-severity vulnerability in Linux kernel, published on 18 Jun 2025. 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:
drm/sun4i: dsi: Prevent underflow when computing packet sizes
Currently, the packet overhead is subtracted using unsigned arithmetic. With a short sync pulse, this could underflow and wrap around to near the maximal u16 value. Fix this by using signed subtraction. The call to max() will correctly handle any negative numbers that are produced.
Apply the same fix to the other timings, even though those subtractions are less likely to underflow.
Weakness: CWE-191
Which versions are affected by CVE-2022-50036?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-50036?
Apply the vendor's patch.
Is CVE-2022-50036 being exploited?
There is no known exploitation of CVE-2022-50036 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-50036, GHSA-jr2f-hw4r-48cj, UBUNTU-CVE-2022-50036.