CVE-2026-74546

Summary

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

hwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read

If the fan data becomes 0 between the FAN_DATA_VALID() check and the FAN_PERIOD_TO_RPM() conversion, it will result in a divide-by-zero crash due to a race with a concurrent update of the cached fan value.

Fix a TOCTOU issue by reading fan data once.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxfc958a61ff6d34a0ec42744d3ff524ee202b2e9f < d328175045176f85c15c369bd21dc551351e7935affected
LinuxLinuxfc958a61ff6d34a0ec42744d3ff524ee202b2e9f < 832069bec79cf6f903441c5769d3cdba95d0af33affected
LinuxLinuxfc958a61ff6d34a0ec42744d3ff524ee202b2e9f < 96ad57d31763559d376416cdf3bf5ae79bbbebecaffected
LinuxLinuxfc958a61ff6d34a0ec42744d3ff524ee202b2e9f < 76963b04b2d1c648d69949d8dd521e1ff7f40b51affected
LinuxLinuxfc958a61ff6d34a0ec42744d3ff524ee202b2e9f < 1b46fe9dc8f8de59310f37e6c5e5c0e05ded46c3affected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux6.6.151 <= 6.6.*unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2-rc6 <= *unaffected

Weaknesses

References