CVE-2026-63931 iio: chemical: scd30: fix division by zero in write_raw
A local attacker can cause a kernel crash by writing zero to the sampling frequency sysfs attribute in the SCD30 driver.
- 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-2026-63931?
CVE-2026-63931 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: chemical: scd30: fix division by zero in write_raw
Add a zero check for val2 before using it as a divisor when setting the sampling frequency. A user writing a zero fractional part to the sampling_frequency sysfs attribute triggers a division by zero in the kernel.
Which versions are affected by CVE-2026-63931?
How do I fix CVE-2026-63931?
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-2026-63931 being exploited?
There is no known exploitation of CVE-2026-63931 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-63931, DEBIAN-CVE-2026-63931, GHSA-63gc-r7wc-mrxq, ROOT-OS-UBUNTU-2204-CVE-2026-63931, UBUNTU-CVE-2026-63931.