Vulnerability 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.
References
- https://git.kernel.org/stable/c/075fce376cf852db9293481edce07c181a9b1f46
- https://git.kernel.org/stable/c/31ce62d36d859423dc39f9902f7c4c307b2e00e3
- https://git.kernel.org/stable/c/4eed33c7db5c0c573928d28d8a2c003642c679b8
- https://git.kernel.org/stable/c/70d9a71aa407044d70b50d356b6decf6659c4d56
- https://git.kernel.org/stable/c/aa9429edf9fc0e90d6f4da19ea4b5495a54ab117
- https://git.kernel.org/stable/c/f0b791a006512a48b6348494cb6960598fa99a58
FAQ
What is CVE-2026-74552?
CVE-2026-74552 is a documented vulnerability. 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, im...
How severe is CVE-2026-74552?
CVSS scoring is not yet available for CVE-2026-74552. Check NVD for updates.
Is there a patch for CVE-2026-74552?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.