Division by zero in Linux kernel - CVE-2026-98409

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to division by zero in the rtd119x watchdog driver's rtd119x_wdt_probe() function when initializing the watchdog device with a clock rate of zero. A local user can trigger the affected initialization path to cause a denial of service.

Affected software

How to mitigate CVE-2026-98409

External References

• https://git.kernel.org/stable/c/1f22001b34984350844d629862f70934770cb796
• https://git.kernel.org/stable/c/5af7d2cbd20f893def03c8310a460ade66a5d822
• https://git.kernel.org/stable/c/757c721545b9ffac5c3042a0cd3685ea28af7e81
• https://git.kernel.org/stable/c/8a12e049d517d7dee78500633f8f0e47262a67e0
• https://git.kernel.org/stable/c/b4ede87765a2e58ca4f18f5f8037c4826b9cc93f

Related Security Bulletins

• Division by zero in Linux kernel watchdog driver
• Debian update for linux