CVE-2026-46021
Description
In the Linux kernel, the following vulnerability has been resolved: thermal: core: Fix thermal zone governor cleanup issues If thermal_zone_device_register_with_trips() fails after adding a thermal governor to the thermal zone being registered, the governor is not removed from it as appropriate which may lead to a memory leak. In turn, thermal_zone_device_unregister() calls thermal_set_governor() without acquiring the thermal zone lock beforehand which may race with a governor update via sysfs and may lead to a use-after-free in that case. Address these issues by adding two thermal_set_governor() calls, one to thermal_release() to remove the governor from the given thermal zone, and one to the thermal zone registration error path to cover failures preceding the thermal zone device registration.
How to fix
- linux linux_kernel6.6.140, 6.12.86, 6.18.27, 7.0.4 or later
- git.kernel.org/stable/c/37a430a2d4e66ec8238da6c7f7e48809bf265e13
- git.kernel.org/stable/c/41ff66baf81c6541f4f985dd7eac4494d03d9440
- git.kernel.org/stable/c/64d4ebf91d082034bbc5ae3ba2d7fd800bc02d06
- git.kernel.org/stable/c/75f8f3c3e09122270986de9d7aa347d701676761
- git.kernel.org/stable/c/f412e541d25a3dfaf3d53e012ade6ff03cae8a45
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.2 ≤ v < 6.6.140, 6.7 ≤ v < 6.12.86, 6.13 ≤ v < 6.18.27, 6.19 ≤ v < 7.0.4 | 6.6.140, 6.12.86, 6.18.27, 7.0.4 |
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