CVE-2024-42253

Summary

CVE-2024-42253 is a vulnerability affecting the Linux kernel's gpio subsystem, specifically the pca953x driver. This issue arises from a race condition in the function pca953x_irq_bus_sync_unlock(), where the 'i2c_lock' is not held consistently when setting interrupt latch and mask. Consequently, a request may overwrite the incorrect register, leading to unexpected behavior. The problem occurs approximately once per thousand reboots on i.MX8MP-based systems. The vulnerability is resolved by ensuring that 'i2c_lock' is acquired before setting the interrupt latch and mask.

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