---
id: CVE-2026-90245
title: |-
  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 arit…
summary: |-
  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 arit…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    d8c1a9579cbd8f4ac5cbd5a10f1afb5ee64adf30
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    2ac6e30a552e6f9932c21c865a5c69f40c8aef64
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    413d763439ba68e5d547538e6b6c7de97d5818a5
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    e8d4e4cf388daeb49704f3de10b203034f28eb90
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    a6decd4e72fc5846d3b268bd085a2089213fd5ee
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    33e54e3e0b2ca959304e62c3d84f0ad49bbe1afe
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    7bf36dc23bcf3496dec274a46ae0aaff4961ea03
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    7b5c7bc55e13e7f5ac7b1eaf5c6d690389ea5ee3
  - Linux 2.6.12
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:20.530'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90245'
references:
  - url: 'https://git.kernel.org/stable/c/2ac6e30a552e6f9932c21c865a5c69f40c8aef64'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/33e54e3e0b2ca959304e62c3d84f0ad49bbe1afe'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/413d763439ba68e5d547538e6b6c7de97d5818a5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7b5c7bc55e13e7f5ac7b1eaf5c6d690389ea5ee3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7bf36dc23bcf3496dec274a46ae0aaff4961ea03'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a6decd4e72fc5846d3b268bd085a2089213fd5ee'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d8c1a9579cbd8f4ac5cbd5a10f1afb5ee64adf30'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e8d4e4cf388daeb49704f3de10b203034f28eb90'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.845Z'
epss: 0.00211
epssPercentile: 0.10038
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.