---
title: "CVE-2026-89611: Linux Kernel ntfs - Memory Corruption"
description: "Linux kernel ntfs subsystem contains a buffer overflow vulnerability caused by improper validation of non-resident attribute name offsets during conversion between non-sparse and sparse attributes, letting attackers cause memory corruption, exploit requires crafted malicious MFT record."
url: https://panop.io/threat-heartbeat/CVE-2026-89611/
---

# CVE-2026-89611 Linux Kernel ntfs - Memory Corruption

Linux kernel ntfs subsystem contains a buffer overflow vulnerability caused by improper validation of non-resident attribute name offsets during conversion between non-sparse and sparse attributes, letting attackers cause memory corruption, exploit requires crafted malicious MFT record.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.55% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89611)

## Details

Type

Memory Corruption

CVSS vector

CVSS:3.1/AV:N/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 ntfs attribute offset 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-2026-89611](https://nvd.nist.gov/vuln/detail/CVE-2026-89611)
- [https://git.kernel.org/stable/c/a83e82b0ec3ae523028e24813f23f18b43e8fc1c](https://git.kernel.org/stable/c/a83e82b0ec3ae523028e24813f23f18b43e8fc1c)
- [https://git.kernel.org/stable/c/cd7b3dc7557faadeea626034e3bac68a449851ef](https://git.kernel.org/stable/c/cd7b3dc7557faadeea626034e3bac68a449851ef)

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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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