CVE-2026-72394

/// Technical description

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 aspeed_tach_val_to_rpm() 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 tach_div evaluates to 0. The subsequent call to do_div() 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References