CVE-2021-47393

A vulnerability was found in the Linux kernel's hwmon subsystem, specifically in the mlxreg-fan driver. The issue arises when the driver’s sysfs interface for controlling fan speed does not properly handle cases where the requested minimum fan speed exceeds the maximum allowable value. When the value provided is out of bounds, it results in a non-zero return code that prevents updates to thermal statistics, which can lead to a slab-out-of-bounds error, potentially causing system instability or crashes due to improper access to memory.

This vulnerability is rated as a moderate severity because it can disrupt system operation by causing crashes or unpredictable behaviour under specific conditions.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.