Security Flaw in Linux Kernel Affecting Serial Driver Functionality

CVE-2026-98883

What is CVE-2026-98883?

A vulnerability has been identified in the Linux kernel affecting the 8250 serial driver. The issue arises during the probe phase when the system fails to recognize a specific UART type (UPIO_AU). This can trigger warnings that indicate unsupported UART types, potentially disrupting functionality in MIPS Alchemy systems. A proposed resolution involves modifying the set_io_from_upio() function to acknowledge UPIO_AU without making additional changes, as necessary configurations are already set up in the corresponding platform setup routines. This fix has been verified on the Alchemy Au1300 platform, ensuring stability and performance.

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