CVE-2026-72394

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (aspeed-g6-pwm-tach) Guard fan RPM calculation against divide-by-zero

Sashiko reports:

In the aspeed-g6-pwm-tacho driver, the aspeedtachvaltorpm() function calculates the fan RPM using the tachometer value. However, it does not check if the tachometer value is zero before performing the division.

If the hardware reports a tachometer value of 0 (which can happen due to an extremely fast pulse, a stuck edge, or a hardware glitch), the calculated tachdiv evaluates to 0. The subsequent call to dodiv() with tach_div as the divisor triggers a divide-by-zero exception, leading to a kernel panic.

Check the divisor against zero to fix the problem.