Vulnerability in AMBA PL011 Serial Driver for Linux Kernel by ARM

CVE-2022-50625

What is CVE-2022-50625?

In the AMBA PL011 serial driver within the Linux Kernel, a potential access issue arises when the SBSA UART attempts to interact with the DMACR register. This is particularly relevant when the DMA engine is enabled, leading to unhandled faults and segmentation faults in systems utilizing virtual SBSA PL011 devices, such as those emulated by Xen. The driver has been modified to check for the appropriate DMA usage before accessing the DMACR register, thereby preventing unnecessary faults and improving system stability.

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