Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f6d0775119fb905fb02eafa98d575cf8ee792d46 before 31ce62d36d859423dc39f9902f7c4c307b2e00e3; affected f6d0775119fb905fb02eafa98d575cf8ee792d46 before 4eed33c7db5c0c573928d28d8a2c003642c679b8; affected f6d0775119fb905fb02eafa98d575cf8ee792d46 before 70d9a71aa407044d70b50d356b6decf6659c4d56; affected f6d0775119fb905fb02eafa98d575cf8ee792d46 before 075fce376cf852db9293481edce07c181a9b1f46; affected f6d0775119fb905fb02eafa98d575cf8ee792d46 before f0b791a006512a48b6348494cb6960598fa99a58; affected f6d0775119fb905fb02eafa98d575cf8ee792d46 before aa9429edf9fc0e90d6f4da19ea4b5495a54ab117 |
| Linux / Linux | affected 6.0; unaffected 0 before 6.0; unaffected 6.1.183 through 6.1.*; unaffected 6.6.151 through 6.6.*; unaffected 6.12.103 through 6.12.*; unaffected 6.18.44 through 6.18.*; unaffected 7.1.8 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- 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/075fce376cf852db9293481edce07c181a9b1f46
- https://git.kernel.org/stable/c/f0b791a006512a48b6348494cb6960598fa99a58
- https://git.kernel.org/stable/c/aa9429edf9fc0e90d6f4da19ea4b5495a54ab117