CVE-2026-97481

/// Technical description

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

serial: 8250: fix possible ISR soft lockup

There are rare cases in which the host gets stuck in the ISR because it

is flooded with messages during the startup phase.

The reason for the soft lockup in the ISR is the missing FIFO error IRQ

(FIFOE) handling. Not handling it and reporting IRQ_HANDLED triggers

the IRQ immediately again.

Fix this by adding a check for the FIFOE status and clearing the FIFO

if no data is ready (DR).

This behavior was observed on an AM62L device which uses the OMAP 8250

driver. Fix it for all 8250 drivers, since the OMAP driver's special

IRQ setup handling may trigger this behavior more frequently, but it

is not ensured that other 8250 drivers aren't affected.

/// 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