CVE-2026-74546 hwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read
A race condition in the adt7470 hardware monitoring driver causes a divide-by-zero crash, leading to local denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74546?
CVE-2026-74546 is a vulnerability in Linux, published on 15 Aug 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:
hwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read
If the fan data becomes 0 between the FAN_DATA_VALID() check and the FAN_PERIOD_TO_RPM() conversion, it will result in a divide-by-zero crash due to a race with a concurrent update of the cached fan value.
Fix a TOCTOU issue by reading fan data once.
Which versions are affected by CVE-2026-74546?
How do I fix CVE-2026-74546?
Apply the vendor's patch.
Is CVE-2026-74546 being exploited?
There is no known exploitation of CVE-2026-74546 in the wild and no public exploit code.
Sources
Also known as AZL-96036, BELL-CVE-2026-74546, DEBIAN-CVE-2026-74546, GHSA-x8wx-2r8m-399g, UBUNTU-CVE-2026-74546.