CVE-2026-74552

hwmon: (lm90) Only report alarms if driver is ready

State: Published
Severity: Not scored
Published: Aug 15, 2026
Updated: Aug 19, 2026
Reserved: Aug 15, 2026

Description

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

hwmon: (lm90) Only report alarms if driver is ready

Userspace can read sysfs attributes before driver registration is complete, immediately after devm_hwmon_device_register_with_info() has been called. At that time, data->hwmon_dev is not yet initialized. This can trigger a NULL pointer access since lm90_update_device() and with it lm90_update_alarms_locked() will be called. This call schedules report_work and lm90_report_alarms(), which passes the still-NULL data->hwmon_dev to hwmon_notify_event() and triggers a NULL pointer dereference.

Fix the problem by only scheduling the report and alert workers data->hwmon_dev is set.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	f6d0775119fb905fb02eafa98d575cf8ee792d46 to before 31ce62d36d859423dc39f9902f7c4c307b2e00e3Affected f6d0775119fb905fb02eafa98d575cf8ee792d46 to before 4eed33c7db5c0c573928d28d8a2c003642c679b8Affected f6d0775119fb905fb02eafa98d575cf8ee792d46 to before 70d9a71aa407044d70b50d356b6decf6659c4d56Affected f6d0775119fb905fb02eafa98d575cf8ee792d46 to before 075fce376cf852db9293481edce07c181a9b1f46Affected f6d0775119fb905fb02eafa98d575cf8ee792d46 to before f0b791a006512a48b6348494cb6960598fa99a58Affected f6d0775119fb905fb02eafa98d575cf8ee792d46 to before aa9429edf9fc0e90d6f4da19ea4b5495a54ab117Affected
LinuxLinux	6.0Affected before 6.0Not affected 6.1.183 through 6.1.Not affected 6.6.151 through 6.6.Not affected 6.12.103 through 6.12.Not affected 6.18.44 through 6.18.Not affected 7.1.8 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

f6d0775119fb905fb02eafa98d575cf8ee792d46 to before 31ce62d36d859423dc39f9902f7c4c307b2e00e3Affected
f6d0775119fb905fb02eafa98d575cf8ee792d46 to before 4eed33c7db5c0c573928d28d8a2c003642c679b8Affected
f6d0775119fb905fb02eafa98d575cf8ee792d46 to before 70d9a71aa407044d70b50d356b6decf6659c4d56Affected
f6d0775119fb905fb02eafa98d575cf8ee792d46 to before 075fce376cf852db9293481edce07c181a9b1f46Affected
f6d0775119fb905fb02eafa98d575cf8ee792d46 to before f0b791a006512a48b6348494cb6960598fa99a58Affected
f6d0775119fb905fb02eafa98d575cf8ee792d46 to before aa9429edf9fc0e90d6f4da19ea4b5495a54ab117Affected

LinuxLinux

6.0Affected
before 6.0Not affected
6.1.183 through 6.1.*Not affected
6.6.151 through 6.6.*Not affected
6.12.103 through 6.12.*Not affected
6.18.44 through 6.18.*Not affected
7.1.8 through 7.1.*Not affected
7.2 and laterNot affected

References

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