CVE-2026-74546 PUBLISHED

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

Assigner: Linux
Reserved: 15.08.2026 Published: 15.08.2026 Updated: 15.08.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from fc958a61ff6d34a0ec42744d3ff524ee202b2e9f to d328175045176f85c15c369bd21dc551351e7935 (excl.)
  • affected from fc958a61ff6d34a0ec42744d3ff524ee202b2e9f to 832069bec79cf6f903441c5769d3cdba95d0af33 (excl.)
  • affected from fc958a61ff6d34a0ec42744d3ff524ee202b2e9f to 96ad57d31763559d376416cdf3bf5ae79bbbebec (excl.)
  • affected from fc958a61ff6d34a0ec42744d3ff524ee202b2e9f to 76963b04b2d1c648d69949d8dd521e1ff7f40b51 (excl.)
  • affected from fc958a61ff6d34a0ec42744d3ff524ee202b2e9f to 1b46fe9dc8f8de59310f37e6c5e5c0e05ded46c3 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 5.15 is affected
  • unaffected from 0 to 5.15 (excl.)
  • unaffected from 6.6.151 to 6.6.* (incl.)
  • unaffected from 6.12.103 to 6.12.* (incl.)
  • unaffected from 6.18.44 to 6.18.* (incl.)
  • unaffected from 7.1.8 to 7.1.* (incl.)
  • unaffected from 7.2-rc6 to * (incl.)

References