CVE-2026-93142 thermal/drivers/rcar: Fix error checking in probe()
A null pointer dereference in the Linux kernel rcar thermal driver probe function can cause a system crash, requiring a kernel patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93142?
CVE-2026-93142 is a vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
thermal/drivers/rcar: Fix error checking in probe()
This code accidentally calls thermal_zone_device_enable() before checking whether thermal_zone_device_register_with_trips() failed. Move the call until later to avoid an error pointer dereference of "priv->zone".
The driver works differently depending on if we are using OF thermal or not. We use thermal_add_hwmon_sysfs() if we are using OF thermal and call thermal_zone_device_enable() if not. We can share same error check for if either of these fail.
Moving the thermal_zone_device_enable() call is a bit cleaner as well. The original code used a three step process to cleanup: 1. Call thermal_zone_device_unregister() to cleanup. 2. Set priv->zone to an error pointer to preserve the error code. 3. Set priv->zone to NULL to avoid a second call to thermal_zone_device_unregister() in the rcar_thermal_remove() function.
Now we can just do a direct goto error_unregister and rcar_thermal_remove() handles the cleanup properly.
Which versions are affected by CVE-2026-93142?
How do I fix CVE-2026-93142?
Apply the vendor's patch.
Is CVE-2026-93142 being exploited?
There is no known exploitation of CVE-2026-93142 in the wild and no public exploit code.
Sources
Also known as AZL-102708, BELL-CVE-2026-93142, DEBIAN-CVE-2026-93142, GHSA-hm78-cgjx-c8pf, UBUNTU-CVE-2026-93142.