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

spi: Fix deadlock when adding SPI controllers on SPI buses

Currently we have a global spi_add_lock which we take when adding new
devices so that we can check that we're not trying to reuse a chip
select that's already controlled.  This means that if the SPI device is
itself a SPI controller and triggers the instantiation of further SPI
devices we trigger a deadlock as we try to register and instantiate
those devices while in the process of doing so for the parent controller
and hence already holding the global spi_add_lock.  Since we only care
about concurrency within a single SPI bus move the lock to be per
controller, avoiding the deadlock.

This can be easily triggered in the case of spi-mux.

kernel.org https://git.kernel.org/stable/c/6098475d4cb48d821bdf453c61118c56e26294f0 [No types assigned]

kernel.org https://git.kernel.org/stable/c/722ef19a161ce3fffb3d1b01ce2301c306639bdd [No types assigned]