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Change History

In the Linux kernel, the following vulnerability has been resolved:

ACPI: processor: Update cpuidle driver check in __acpi_processor_start()

Commit 7a8c994cbb2d ("ACPI: processor: idle: Optimize ACPI idle
driver registration") moved the ACPI idle driver registration to
acpi_processor_driver_init() and acpi_processor_power_init() does
not register an idle driver any more.

Accordingly, the cpuidle driver check in __acpi_processor_start() needs
to be updated to avoid calling acpi_processor_power_init() without a
cpuidle driver, in which case the registration of the cpuidle device
in that function would lead to a NULL pointer dereference in
__cpuidle_register_device().

https://git.kernel.org/stable/c/0089ce1c056aee547115bdc25c223f8f88c08498

https://git.kernel.org/stable/c/68f38f648e4b5bed2aeadd2f711e25302e6490f8

https://git.kernel.org/stable/c/6cfed39c2ce64ac024bbde458a9727105e0b8c66