CVE-2026-23236 fbdev: smscufx: properly copy ioctl memory to kernelspace
A local attacker can exploit improper memory copying in the smscufx framebuffer driver to cause memory corruption, potentially leading to code execution or privilege escalation.
- 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-2026-23236?
CVE-2026-23236 is a high-severity memory corruption vulnerability in Linux kernel, published on 4 Mar 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:
fbdev: smscufx: properly copy ioctl memory to kernelspace
The UFX_IOCTL_REPORT_DAMAGE ioctl does not properly copy data from userspace to kernelspace, and instead directly references the memory, which can cause problems if invalid data is passed from userspace. Fix this all up by correctly copying the memory before accessing it within the kernel.
Which versions are affected by CVE-2026-23236?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23236?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-23236 being exploited?
There is no known exploitation of CVE-2026-23236 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-78632, BELL-CVE-2026-23236, DEBIAN-CVE-2026-23236, GHSA-6c9m-6m34-wg94, ROOT-OS-DEBIAN-11-CVE-2026-23236, ROOT-OS-DEBIAN-12-CVE-2026-23236 and 4 more.