Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: thermal/drivers/tegra/soctherma: Switch to devm cooling device registration Use devm_thermal_of_cooling_device_register() to simplify resource management and avoid manual cleanup in error paths. As a side effect this change has the benefit of solving an existing issue. Before, the function tegra_soctherm_remove() only called debugfs_remove_recursive() and never called thermal_cooling_device_unregister() for any of the cooling devices registered here. After the driver removal, the thermal framework's cdev list would still hold references to thermal_cooling_device objects whose devdata pointer (ts) pointed to memory already freed by the platform device's devm cleanup. With this change, the cooling device is unregistered when the driver is removed, thus fixing the issue above.

Affected versions

Linux: ce0dbf04f685d48ffdec64a17ebb4965f828c3ff through before 6f2a863e7e9adf6088fe644259576181e60ee5e5 (git); ce0dbf04f685d48ffdec64a17ebb4965f828c3ff through before deaeb7be8e6b04c8b71080acba1bd88698f56b1d (git); ce0dbf04f685d48ffdec64a17ebb4965f828c3ff through before ee126267bc04bfb03816ae9d71ca24c5bf99e739 (git); 4.9 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.