---
title: "CVE-2026-90089: Linux kernel Bluetooth btnxpuart - Buffer Validation"
description: "Linux kernel Bluetooth btnxpuart contains a buffer validation vulnerability caused by missing length checks on the firmware dump header in nxp_process_fw_dump(), letting attackers cause early dump termination or read beyond buffer, exploit requires crafted truncated frames."
url: https://panop.io/threat-heartbeat/CVE-2026-90089/
---

# CVE-2026-90089 Linux kernel Bluetooth btnxpuart - Buffer Validation

Linux kernel Bluetooth btnxpuart contains a buffer validation vulnerability caused by missing length checks on the firmware dump header in nxp\_process\_fw\_dump(), letting attackers cause early dump termination or read beyond buffer, exploit requires crafted truncated frames.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.33% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90089)

## Details

Type

Buffer Validation

Impact

Denial Of Service, Information Disclosure

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for this vulnerability.

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-2026-90089](https://nvd.nist.gov/vuln/detail/CVE-2026-90089)
- [https://git.kernel.org/stable/c/060fa7592bdc043a93b6b7870f5b8551206d315d](https://git.kernel.org/stable/c/060fa7592bdc043a93b6b7870f5b8551206d315d)
- [https://git.kernel.org/stable/c/22d419db7f9a01bea22cfcf66774d2b2fd4bb354](https://git.kernel.org/stable/c/22d419db7f9a01bea22cfcf66774d2b2fd4bb354)
- [https://git.kernel.org/stable/c/a644b8df94966b672ac656577df98bd01bc88393](https://git.kernel.org/stable/c/a644b8df94966b672ac656577df98bd01bc88393)

[← All CVEs](https://panop.io/threat-heartbeat/)

## 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

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)