CVE-2026-80566

Technical Description

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

Input: hynitron_cstxxx - validate touch count and finger IDs

The driver allocates max_touch_num input slots, which are indexed from

zero through max_touch_num - 1. The current check allows a finger ID

equal to max_touch_num to reach cst3xx_report_contact(). While the input

core ignores out-of-range slot indices, reporting touch data without a

valid slot change corrupts the touch state of the previously active slot.

The touch count is read from the controller's report and is used to

index the fixed-size report buffer without first checking its range.

Reject counts larger than the supported number of touch slots before

checking the trailing byte or parsing touch data.

Reject finger IDs equal to or greater than max_touch_num, and return

immediately when an invalid finger ID is encountered so that corrupt

touch frames are discarded instead of reporting partial contact state.

The V821 Avaota F1 board configures the ven

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