Bug 2516975 (CVE-2026-74546) - CVE-2026-74546 kernel: hwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read
Summary: CVE-2026-74546 kernel: hwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fa...
Keywords:
Status: NEW
Alias: CVE-2026-74546
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-15 12:42 UTC by OSIDB Bzimport
Modified: 2026-08-21 08:06 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-15 12:42:02 UTC 
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.
Comment 1 gkamathe 2026-08-21 08:01:10 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081549-CVE-2026-74546-f2c9@gregkh/T
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