Division by zero in Linux kernel - CVE-2026-97970

Vulnerability details

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

The vulnerability exists due to division by zero in the msc313e watchdog driver's msc313e_wdt_probe function when initializing a watchdog device with a zero clock rate. A local privileged user can trigger watchdog device initialization with a zero clock rate to cause a denial of service.

Affected software

How to mitigate CVE-2026-97970

External References

• https://git.kernel.org/stable/c/3ae8eb30f8a0a839bf36fa62e4201ac99946447f
• https://git.kernel.org/stable/c/3c73a37f5e40972ce26d8eeb98e8b938d719b069
• https://git.kernel.org/stable/c/47eae41c630b9d2ce16a528a1517d4d2f857cd47
• https://git.kernel.org/stable/c/5788a6747eda85051838628b40c430ec6343f3c6

Related Security Bulletins

• Division by zero in Linux kernel watchdog driver