---
title: "CVE-2026-89620: Linux Kernel - Buffer Overflow"
description: "Linux kernel intel-thc-hid and intel-quickspi contain a heap buffer overflow caused by missing validation of report size before copying in write_cmd_to_txdma(), letting attackers with crafted HID reports overflow buffers, exploit requires access to hidraw SET_REPORT/SET_FEATURE ioctl."
url: https://panop.io/threat-heartbeat/CVE-2026-89620/
---

# CVE-2026-89620 Linux Kernel - Buffer Overflow

Linux kernel intel-thc-hid and intel-quickspi contain a heap buffer overflow caused by missing validation of report size before copying in write\_cmd\_to\_txdma(), letting attackers with crafted HID reports overflow buffers, exploit requires access to hidraw SET\_REPORT/SET\_FEATURE ioctl.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89620)

## Details

Type

Buffer Overflow

Impact

Denial Of Service, Privilege Escalation

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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 report size validation in intel-thc-hid and intel-quickspi.

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-2026-89620](https://nvd.nist.gov/vuln/detail/CVE-2026-89620)
- [https://git.kernel.org/stable/c/6fcefe71aeb524f6e77fe586fe85d873745e917c](https://git.kernel.org/stable/c/6fcefe71aeb524f6e77fe586fe85d873745e917c)
- [https://git.kernel.org/stable/c/a59cf84441f9a17323c89452cec2bf16724c48a9](https://git.kernel.org/stable/c/a59cf84441f9a17323c89452cec2bf16724c48a9)
- [https://git.kernel.org/stable/c/ee8ad1bb1e96164d51089b1182f1bd5f187e7baa](https://git.kernel.org/stable/c/ee8ad1bb1e96164d51089b1182f1bd5f187e7baa)

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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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