CVE-2026-31741
Description
A flaw was found in the Linux kernel's rz-mtu3-cnt counter module. A local user can exploit this by repeatedly writing '0' to the sysfs enable file, which causes the runtime Power Management (PM) usage count to underflow. This can lead to attempts to access hardware registers with their clocks off, potentially causing system instability or a denial of service (DoS). Additionally, repeated writes of '1' can cause the usage count to increment indefinitely, requiring an equal number of '0' writes to reset it.
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
An adversary that can cause a resource counter to become inaccurate may be able to create situations where resources are not accounted for and not released, thus causing resources to become scarce for future needs.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An adversary that can cause a resource counter to become inaccurate may be able to force an error that causes the product to crash or exit out of its current operation.
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