CVE-2026-80886

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A race condition exists in the msm serial driver when concurrent writes occur from userspace and the kernel to the console. This issue typically manifests during system startup or shutdown. When userspace writes to the TTY device, the driver starts an asynchronous DMA (Direct Memory Access) transfer and releases the port lock. Simultaneously, the kernel printk() path may acquire the port lock and re-configure the UART controller for PIO (Programmed Input/Output) before the DMA operation finishes. This collision can cause the DMA engine to report zero progress, resulting in an infinite loop where the same messages are printed repeatedly to the console.

Recommendations Disable DMA for the console UART instance to ensure a reliable output path.