💣Exploit CVE-2021-47469 - In the Linux kernel, the following vulnerability h

[Maksim]

CVE ID : CVE-2021-47469
Published : May 22, 2024, 7:15 a.m. | 55 minutes ago
Description : 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.
Severity: 0.0 | NA
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