CVE-2026-63935 iio: adc: nxp-sar-adc: fix division by zero in write_raw
A local attacker can cause a kernel crash by writing invalid values to the NXP SAR ADC sampling frequency sysfs attribute.
- 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-2026-63935?
CVE-2026-63935 is a denial of service vulnerability in Linux, published on 19 Jul 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:
iio: adc: nxp-sar-adc: fix division by zero in write_raw
Add a validation check for the sampling frequency value before using it as a divisor. A user writing zero or a negative value to the sampling_frequency sysfs attribute triggers a division by zero in the kernel.
Also prevent unsigned integer underflow when the computed cycle count is smaller than NXP_SAR_ADC_CONV_TIME, which would wrap the u32 inpsamp to a huge value.
Which versions are affected by CVE-2026-63935?
How do I fix CVE-2026-63935?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-63935 being exploited?
There is no known exploitation of CVE-2026-63935 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-63935, GHSA-ph67-42mq-jpw6, UBUNTU-CVE-2026-63935.