---
title: "CVE-2026-80975: Linux Kernel - Memory Corruption"
description: "Linux kernel contains a stack buffer overflow caused by use of an on-stack reply buffer in qnap_mcu_exec() that can be overwritten by late or unsolicited MCU messages, letting attackers cause memory corruption, exploit requires triggering command timeout."
url: https://panop.io/threat-heartbeat/CVE-2026-80975/
---

# CVE-2026-80975 Linux Kernel - Memory Corruption

Linux kernel contains a stack buffer overflow caused by use of an on-stack reply buffer in qnap\_mcu\_exec() that can be overwritten by late or unsolicited MCU messages, letting attackers cause memory corruption, exploit requires triggering command timeout.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-80975)

## Details

Type

Memory Corruption

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 qnap-mcu buffer handling.

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-2026-80975](https://nvd.nist.gov/vuln/detail/CVE-2026-80975)
- [https://git.kernel.org/stable/c/0b6680e306397097a97767447368221fac753809](https://git.kernel.org/stable/c/0b6680e306397097a97767447368221fac753809)
- [https://git.kernel.org/stable/c/47504742cea7878ebd1bf1491bbed923df6b90b1](https://git.kernel.org/stable/c/47504742cea7878ebd1bf1491bbed923df6b90b1)
- [https://git.kernel.org/stable/c/8391ee06d08845a0a165b5fe679ba326915166b2](https://git.kernel.org/stable/c/8391ee06d08845a0a165b5fe679ba326915166b2)

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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

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

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