coretemp

Core Temperature Sensor Driver

Kernel ModuleSafeHardware Sensor

CPU Usage

0-2% (idle in most systems)

Memory

0-5 MB (module memory usage, varies)

Location

Kernel Space

Publisher

Linux Kernel Community

Quick Answer

coretemp is a legitimate Linux kernel module. It exposes CPU core temperatures via sysfs, enabling thermal management and fan control.

Is it a Virus?

✔ NO - Safe

Part of Linux kernel; loaded by thermal subsystem when supported by CPU

Warning

Usually benign, but drivers can be manipulated by rootkits

Verify kernel module source and signing if applicable; use modinfo and verify integrity

Can I Disable?

✔ YES

coretemp is managed by the kernel; disabling may affect temperature readings. In most cases not recommended unless troubleshooting hardware

What is coretemp?

coretemp is the Linux kernel driver that reads CPU die temperatures using on-die sensors (digital thermal sensors) and exposes the readings to user space via sysfs under /sys/class/thermal or /sys/devices/platform. It supports modern Intel/AMD sensors.

The driver hooks into the Linux thermal subsystem to provide per-core temperatures, fan controls, and thermal trip points. It operates in kernel space and communicates with user-space tools like sensors, lm-sensors, and hwmon.

Quick Fact: coretemp has been part of the Linux kernel for thermal monitoring across generations, enabling fine-grained CPU temperature data for cooling policies.

Types of Coretemp Processes

Kernel Module: coretemp.ko loaded into kernel to read temps
User-Space Interfaces: sysfs entries like /sys/class/thermal/thermal_zone*/temp

Is coretemp Safe?

Yes, coretemp is safe when sourced from your distribution's kernel packages and enabled via standard kernel modules.

Is coretemp a Virus or Malware?

The real coretemp driver is not a virus. Malware rarely includes kernel modules; verify via package manager and module signatures.

How to Tell if coretemp is Legitimate or Malware

Location:: Check module path: /lib/modules/$(uname -r)/kernel/drivers/thermal/coretemp.ko or /lib/modules/.../kernel/drivers/hwmon/coretemp.ko.
Module Info:: Run modinfo coretemp to verify vendor. Look for lines like 'firmware', 'license', and 'author'.
Digital Signature:: Check for signature with modinfo -F signer coretemp.ko (if your distro uses module signing).
Resource & Behavior:: Normal usage shows temps in a few MB of kernel memory; suspicious if never unloading or if temps are inconsistent.

Red Flags: Module located outside /lib/modules, unsigned, or loaded without appropriate kernel headers may indicate tampering. Uninstall or blacklist if unsure.

Why Is coretemp Running on My PC?

coretemp runs automatically when a supported CPU is detected and the thermal system is initialized; it can run as long as the kernel is active and sensors are enabled.

Reasons it's running:

Hardware Sensor Availability: Your CPU provides digital thermal sensors; kernel loads coretemp to report temp data.
Thermal Monitoring Daemon: User-space tools like lm-sensors query coretemp for real-time temperatures.
ACPI/Thermals: ACPI tables expose sensors; coretemp reads and exports them to /sys.
System Boot: During boot, kernel initializes thermal subsystem; coretemp registers with hwmon.
Dynamic Reconfiguration: Hot-plug CPU cores or power management changes may reinitialize sensors, causing coretemp to re-emerge.

Can I Disable or Remove coretemp?

Disabling or unloading coretemp can stop accurate temperature reporting. It is safe to disable if you are using alternate sensors; otherwise, keep it enabled.

How to Stop coretemp

Unload Module: sudo rmmod coretemp
Blacklist Module: Add 'blacklist coretemp' to /etc/modprobe.d/blacklist.conf and rebuild initramfs if needed
Disable Sensors via lm-sensors: sudo apt-get remove --purge lm-sensors or disable specific sensor modules
Kernel Parameters: Edit grub config to disable hwmon modules via module.blacklist options at boot
Reboot: Reboot to apply changes and verify coretemp is not loaded

How to Uninstall Coretemp (Optional)

✔ Use your distro's package manager to remove kernel modules or packages that provide coretemp support (e.g., apt, yum, dnf)
✔ If using a custom kernel, rebuild without coretemp support and update initramfs
✔ Ensure you have alternative sensors enabled if needed

Common Problems: Temperature Readings or Driver Issues

If coretemp shows inaccurate temps or fails to initialize:

Common Causes & Solutions

Missing or disabled drivers: Load the coretemp module: sudo modprobe coretemp; verify with lsmod | grep coretemp
Outdated kernel: Update to a newer kernel with updated thermal drivers
Sensor not exposed: Check BIOS/UEFI settings for thermal sensors; enable HW monitor in BIOS
Conflicting sensors: Disable conflicting hwmon sensors or update lm-sensors configuration
Mismatch in sysfs paths: Inspect /sys/class/thermal or /sys/devices/platform for coretemp entries and permissions
GPU/CPU thermal throttling: Thermal throttling can affect temps; adjust cooling solution and fan curves

Quick Fixes:
1. Quick Fixes:
2. 1. Verify module is loaded: lsmod | grep coretemp
3. Inspect sysfs: cat /sys/class/thermal/thermal_zone*/temp
4. Reload module after BIOS changes: sudo rmmod coretemp; sudo modprobe coretemp
5. Update kernel and firmware to latest
6. Check BIOS for sensor enablement and fan controls

Frequently Asked Questions

Is coretemp safe to use?

Yes. It is a standard kernel module for Linux thermal monitoring compiled and shipped with most distributions.

Why is coretemp reading 0°C?

Possible sensor not present, BIOS disabled sensor, or driver misread. Check /sys/class/thermal and BIOS/UEFI settings, then reload the module.

Can I disable coretemp safely?

You can unload the module (rmmod coretemp) or blacklist it, but you may lose accurate temperature readings.

How do I check which cores are monitored?

Use sensors or cat /sys/class/thermal/thermal_zone*/temp to see core temps; look at hwmon sensors for per-core values.

What should I do if temps are too high?

Improve cooling, clean dust, ensure fans run, check thermal design power (TDP); if problems persist, update BIOS/firmware.

Is coretemp tied to LM-sensors?

coretemp is a driver exposed to sensors framework; lm-sensors reads from sysfs entries created by coretemp when loaded.