CVE-2026-90245

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

fbdev: kyro: Validate overlay viewport coordinates

The overlay viewport end coordinates are computed from the viewport

origin and dimensions using 32-bit unsigned arithmetic. Large input

values can cause these calculations to wrap around before the resulting

coordinates are passed to SetOverlayViewPort().

SetOverlayViewPort() packs the viewport coordinates into 16-bit

register fields. The X coordinates are additionally adjusted by +2

and +1 before being written. Validate the coordinate calculations

for 32-bit wraparound and ensure that the adjusted coordinates fit

within their 16-bit register fields before calling

SetOverlayViewPort().

Found by Linux Verification Center (linuxtesting.org) with SVACE.