CVE-2026-46021

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/a172fa18bc370b776ac1510abb0dcb50a7a35fac
• https://git.kernel.org/stable/c/8e563d8db50f303171aceb79eec0807e7ba06951
• https://git.kernel.org/stable/c/d4eb861adde5ce22e459fbd29366f47bb2167977
• https://git.kernel.org/stable/c/37a430a2d4e66ec8238da6c7f7e48809bf265e13
• https://git.kernel.org/stable/c/f412e541d25a3dfaf3d53e012ade6ff03cae8a45
• https://git.kernel.org/stable/c/75f8f3c3e09122270986de9d7aa347d701676761
• https://git.kernel.org/stable/c/64d4ebf91d082034bbc5ae3ba2d7fd800bc02d06
• https://git.kernel.org/stable/c/41ff66baf81c6541f4f985dd7eac4494d03d9440

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