CVE-2026-74711
HighCVSS 8.4Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
A type confusion vulnerability was found in the Linux kernel's hwmon driver for PMBus devices. The pmbus_notify() function incorrectly casts different attribute types to sensor_device_attribute, which may lead to an out-of-bounds read or incorrect mask matching during alerts. The fix changes the attribute structures and sets the index to -1 for attributes that do not trigger notifications.
Risk Assessment
The vulnerability may allow a local attacker to trigger an invalid kernel memory read, potentially leading to information disclosure or a system crash. In extreme cases, it could be exploited for privilege escalation, though it requires access to the hwmon interface.
Recommendation
Immediately update the Linux kernel to a version containing the fix for pmbus_notify. If updating is not possible, restrict access to hwmon interfaces for unprivileged users.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus) Fix type confusion in notification logic Sashiko reports: At the start of the loop in pmbus_notify(), the code unconditionally casts every attribute to a struct sensor_device_attribute: drivers/hwmon/pmbus/pmbus_core.c:pmbus_notify() { for (i = 0; i < data->num_attributes; i++) { struct device_attribute *da = to_dev_attr(data->group.attrs[i]); struct sensor_device_attribute *attr = to_sensor_dev_attr(da); int index = attr->index; ... } However, data->group.attrs can contain other types like struct pmbus_samples_reg or struct pmbus_sensor, which only embed a base struct device_attribute. If da is a struct pmbus_samples_reg, dev_attr is the last member. Casting it to struct sensor_device_attribute and reading the index field appears to access memory past the end of the allocation, which might trigger a slab-out-of-bounds read. Additionally, if da is a struct pmbus_sensor, casting it causes the index field to overlap with the page, phase, and reg fields. Could this produce a garbage mask on little-endian systems that spuriously matches the target reg, page, and flags during an alert? Fix the problem by using struct sensor_device_attr in struct pmbus_sensor and struct pmbus_label. Since those attributes never trigger a notification, set the value of attr->index to -1 for them. Use this value to distinguish from boolean attributes which _can_ trigger a notification and use the index field to encode mask, page, and register values.