CVE-2022-49285 iio: accel: mma8452: use the correct logic to get mma8452_data
A null pointer dereference in the Linux kernel MMA8452 accelerometer driver causes a kernel crash when reading scale attributes.
- 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-2022-49285?
CVE-2022-49285 is a medium-severity vulnerability in Linux kernel, published on 26 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:
iio: accel: mma8452: use the correct logic to get mma8452_data
The original logic to get mma8452_data is wrong, the *dev point to the device belong to iio_dev. we can't use this dev to find the correct i2c_client. The original logic happen to work because it finally use dev->driver_data to get iio_dev. Here use the API to_i2c_client() is wrong and make reader confuse. To correct the logic, it should be like this
struct mma8452_data *data = iio_priv(dev_get_drvdata(dev));
But after commit 8b7651f25962 ("iio: iio_device_alloc(): Remove unnecessary self drvdata"), the upper logic also can't work. When try to show the avialable scale in userspace, will meet kernel dump, kernel handle NULL pointer dereference.
So use dev_to_iio_dev() to correct the logic.
Dual fixes tags as the second reflects when the bug was exposed, whilst the first reflects when the original bug was introduced.
Weakness: CWE-476
Which versions are affected by CVE-2022-49285?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49285?
Apply the vendor's patch.
Is CVE-2022-49285 being exploited?
There is no known exploitation of CVE-2022-49285 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49285, GHSA-m279-rgmp-gm5j, ROOT-OS-DEBIAN-11-CVE-2022-49285, UBUNTU-CVE-2022-49285.