CVE-2026-98408 watchdog: rzv2h: Avoid division by zero
A division by zero in the Linux kernel watchdog driver can cause a system panic, leading to 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-2026-98408?
CVE-2026-98408 is a denial of service vulnerability in Linux, published on 14 Oct 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:
watchdog: rzv2h: Avoid division by zero
clk_get_rate() could return 0. Avoid a division by zero panic.
Which versions are affected by CVE-2026-98408?
How do I fix CVE-2026-98408?
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-2026-98408 being exploited?
There is no known exploitation of CVE-2026-98408 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98408, DEBIAN-CVE-2026-98408, GHSA-6mqr-mrxq-wr8r, UBUNTU-CVE-2026-98408.