CVE-2026-80886

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

serial: msm: Disable DMA for kernel console UART

At the moment, concurrent writes from userspace and the kernel to the

console can trigger a race condition that results in an infinite loop of

the same messages printed over and over again. This is most likely to

happen during system startup or shutdown when the init system starts/stops

a large number of system services that interact with various kernel code.

When userspace writes to the TTY device, the driver initiates an

asynchronous DMA transfer and releases the port lock. At the same moment,

the kernel printk path might grab the port lock and re-configure the UART

controller for PIO, without waiting for the DMA operation to complete. It

seems like this collision results in zero progress being reported for the

DMA engine, so the same text is printed to the console over and over again.

For the kernel console, we want a reliable output path that will be

functional e

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References