CVE-2026-74552

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf6d0775119fb905fb02eafa98d575cf8ee792d46 < 4eed33c7db5c0c573928d28d8a2c003642c679b8affected
LinuxLinuxf6d0775119fb905fb02eafa98d575cf8ee792d46 < 70d9a71aa407044d70b50d356b6decf6659c4d56affected
LinuxLinuxf6d0775119fb905fb02eafa98d575cf8ee792d46 < 075fce376cf852db9293481edce07c181a9b1f46affected
LinuxLinuxf6d0775119fb905fb02eafa98d575cf8ee792d46 < f0b791a006512a48b6348494cb6960598fa99a58affected
LinuxLinuxf6d0775119fb905fb02eafa98d575cf8ee792d46 < aa9429edf9fc0e90d6f4da19ea4b5495a54ab117affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
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