CVE-2025-21783 gpiolib: Fix crash on error in gpiochip_get_ngpios()
A NULL pointer dereference in the Linux kernel GPIO subsystem can cause a system crash when specific initialization errors occur.
- 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-2025-21783?
CVE-2025-21783 is a medium-severity vulnerability in Linux kernel, published on 27 Feb 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:
gpiolib: Fix crash on error in gpiochip_get_ngpios()
The gpiochip_get_ngpios() uses chip_*() macros to print messages. However these macros rely on gpiodev to be initialised and set, which is not the case when called via bgpio_init(). In such a case the printing messages will crash on NULL pointer dereference. Replace chip_*() macros by the respective dev_*() ones to avoid such crash.
Weakness: CWE-476
Which versions are affected by CVE-2025-21783?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21783?
Apply the vendor's patch.
Is CVE-2025-21783 being exploited?
There is no known exploitation of CVE-2025-21783 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-57926, BELL-CVE-2025-21783, DEBIAN-CVE-2025-21783, GHSA-8v5w-hx5q-6wch, ROOT-OS-UBUNTU-2404-CVE-2025-21783, UBUNTU-CVE-2025-21783.