---
title: "CVE-2026-19676: Linux PECI - Broken Access Control"
description: "Linux PECI drivers with CONFIG_USERSPACE enabled contain an arbitrary kernel read/write vulnerability caused by unchecked user-supplied buffer pointers in peci_transfer(), letting local user-mode threads with PECI device access escape to kernel with full read/write and code execution, exploit requires local code execution with PECI device access."
url: https://panop.io/threat-heartbeat/CVE-2026-19676/
---

# CVE-2026-19676 Linux PECI - Broken Access Control

Linux PECI drivers with CONFIG\_USERSPACE enabled contain an arbitrary kernel read/write vulnerability caused by unchecked user-supplied buffer pointers in peci\_transfer(), letting local user-mode threads with PECI device access escape to kernel with full read/write and code execution, exploit requires local code execution with PECI device access.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-19676)

## Details

Type

Broken Access Control

Impact

Remote Code Execution, Information Disclosure, Data Tampering

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

21 October 2026

Updated

22 October 2026

Weakness

[CWE-822](https://cwe.mitre.org/data/definitions/822.html)

## Vendor fix

Update to the fixed kernel version with K\_SYSCALL\_MEMORY\_READ() and K\_SYSCALL\_MEMORY\_WRITE() checks on PECI buffers.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-19676](https://nvd.nist.gov/vuln/detail/CVE-2026-19676)
- [https://github.com/zephyrproject-rtos/zephyr/commit/d7faf323d52b7e8845a63b1f854a82bdda44c261](https://github.com/zephyrproject-rtos/zephyr/commit/d7faf323d52b7e8845a63b1f854a82bdda44c261)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-g66q-frxm-3hfg](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-g66q-frxm-3hfg)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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