---
title: "CVE-2026-89471: Linux Kernel - Out of Bounds Write"
description: "Linux kernel power supply cros_usbpd-charger contains a buffer overflow caused by improper validation of EC-reported port counts in cros_usbpd_charger_probe(), letting a malicious or compromised EC cause out-of-bounds write, exploit requires malicious or compromised EC."
url: https://panop.io/threat-heartbeat/CVE-2026-89471/
---

# CVE-2026-89471 Linux Kernel - Out of Bounds Write

Linux kernel power supply cros\_usbpd-charger contains a buffer overflow caused by improper validation of EC-reported port counts in cros\_usbpd\_charger\_probe(), letting a malicious or compromised EC cause out-of-bounds write, exploit requires malicious or compromised EC.

CVSS base score 8.4 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.14% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89471)

## Details

Type

Out of Bounds Write

Impact

Denial Of Service, Privilege Escalation

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for EC port count validation.

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-2026-89471](https://nvd.nist.gov/vuln/detail/CVE-2026-89471)
- [https://git.kernel.org/stable/c/c46c9f447415ca802afab51dea1eafc08ddff1c6](https://git.kernel.org/stable/c/c46c9f447415ca802afab51dea1eafc08ddff1c6)
- [https://git.kernel.org/stable/c/3d1e01443b221081258ff34ea0cdd0431e4ff62e](https://git.kernel.org/stable/c/3d1e01443b221081258ff34ea0cdd0431e4ff62e)
- [https://git.kernel.org/stable/c/48355ce49359740f52e94d3623f6fc557ce341f0](https://git.kernel.org/stable/c/48355ce49359740f52e94d3623f6fc557ce341f0)
- [https://git.kernel.org/stable/c/78be8b7403ff7638162438b664a07d19da76059e](https://git.kernel.org/stable/c/78be8b7403ff7638162438b664a07d19da76059e)
- [https://git.kernel.org/stable/c/fd29d08ee487f3bf50f2575aaa74f78a74b09b21](https://git.kernel.org/stable/c/fd29d08ee487f3bf50f2575aaa74f78a74b09b21)
- [https://git.kernel.org/stable/c/0b5096f6804161b61451b1cec0e38678630be849](https://git.kernel.org/stable/c/0b5096f6804161b61451b1cec0e38678630be849)
- [https://git.kernel.org/stable/c/2746d502b12b343384fb747bdef9cbcfbd7444a2](https://git.kernel.org/stable/c/2746d502b12b343384fb747bdef9cbcfbd7444a2)
- [https://git.kernel.org/stable/c/a1905375dfc0b9612bbee52fc066e3a70c0d671d](https://git.kernel.org/stable/c/a1905375dfc0b9612bbee52fc066e3a70c0d671d)

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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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