CVE-2026-68356 watchdog: airoha: Prevent division by zero when clock frequency is zero
A division by zero in the Airoha watchdog driver causes a kernel crash if the clock frequency is zero, 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-2026-68356?
CVE-2026-68356 is a denial of service vulnerability in Linux, published on 10 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:
watchdog: airoha: Prevent division by zero when clock frequency is zero
clk_get_rate() can return 0 when the clock provider is not properly configured or the clock is unmanaged. The driver uses wdt_freq as a divisor directly in airoha_wdt_probe() to compute max_timeout and in airoha_wdt_get_timeleft() to compute the remaining time, which results in a division by zero.
Add a check for wdt_freq == 0 in probe and return -EINVAL with dev_err_probe() to prevent the division by zero and provide a diagnostic message.
Which versions are affected by CVE-2026-68356?
How do I fix CVE-2026-68356?
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-2026-68356 being exploited?
There is no known exploitation of CVE-2026-68356 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68356, DEBIAN-CVE-2026-68356, GHSA-cq6f-qj9v-h84p, UBUNTU-CVE-2026-68356.