In the Linux kernel, the following vulnerability has been resolved: counter: rz-mtu3-cnt: prevent counter from being toggled multiple times Runtime PM counter is incremented / decremented each time the sysfs enable file is written to. If user writes 0 to the sysfs enable file multiple times, runtime PM usage count underflows, generating the following message. rz-mtu3-counter rz-mtu3-counter.0: Runtime PM usage count underflow! At the same time, hardware registers end up being accessed with clocks off in rz_mtu3_terminate_counter() to disable an already disabled channel. If user writes 1 to the sysfs enable file multiple times, runtime PM usage count will be incremented each time, requiring the same number of 0 writes to get it back to 0. If user writes 0 to the sysfs enable file while PWM is in progress, PWM is stopped without counter being the owner of the underlying MTU3 channel. Check against the cached count_is_enabled value and exit if the user is trying to set the same enable value.

An update of the linux package has been released.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - counter: rz-mtu3-cnt: prevent counter from being toggled multiple times Runtime PM counter is incremented     / decremented each time the sysfs enable file is written to. If user writes 0 to the sysfs enable file     multiple times, runtime PM usage count underflows, generating the following message. rz-mtu3-counter rz-     mtu3-counter.0: Runtime PM usage count underflow! At the same time, hardware registers end up being     accessed with clocks off in rz_mtu3_terminate_counter() to disable an already disabled channel. If user     writes 1 to the sysfs enable file multiple times, runtime PM usage count will be incremented each time,     requiring the same number of 0 writes to get it back to 0. If user writes 0 to the sysfs enable file while     PWM is in progress, PWM is stopped without counter being the owner of the underlying MTU3 channel. Check     against the cached count_is_enabled value and exit if the user is trying to set the same enable value.
    (CVE-2026-31741)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
340680	Ubuntu 24.04 LTS / Pro Realtime 24.04 LTS : Linux kernel (Raspberry Pi) vulnerabilities (USN-8665-1)	Nessus	Ubuntu Local Security Checks	Local	high
335080	openSUSE 16: cluster-md-kmp-64kb / cluster-md-kmp-azure / cluster-md-kmp-default / etc (openSUSE-SU-2026:21555-1)	Nessus	SuSE Local Security Checks	Local	high
333798	Photon OS 5.0: Linux PHSA-2026-5.0-92-0849	Nessus	PhotonOS Local Security Checks	Local	high
318365	Photon OS 5.0: Linux PHSA-2026-5.0-0849	Nessus	PhotonOS Local Security Checks	Local	high
312219	Linux Distros Unpatched Vulnerability : CVE-2026-31741	Nessus	Misc.	Local	medium

Detections

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CVE-2026-31741

medium

Tenable Plugins

high

high

high

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medium