---
title: "CVE-2026-89612: Linux kernel - Out of Bounds Read"
description: "Linux kernel contains an out-of-bounds read caused by improper handling of NTFS boot sector MFT LCNs, letting attackers trigger memory corruption via crafted high-bit values, exploit requires crafted NTFS boot sector."
url: https://panop.io/threat-heartbeat/CVE-2026-89612/
---

# CVE-2026-89612 Linux kernel - Out of Bounds Read

Linux kernel contains an out-of-bounds read caused by improper handling of NTFS boot sector MFT LCNs, letting attackers trigger memory corruption via crafted high-bit values, exploit requires crafted NTFS boot sector.

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-2026-89612)

## Details

Type

Out of Bounds Read

Impact

Denial Of Service

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 with the fix for NTFS boot sector LCN 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-2026-89612](https://nvd.nist.gov/vuln/detail/CVE-2026-89612)
- [https://git.kernel.org/stable/c/8f8420b68a6f05ca2b03779d8208814ec539b9e5](https://git.kernel.org/stable/c/8f8420b68a6f05ca2b03779d8208814ec539b9e5)
- [https://git.kernel.org/stable/c/cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2](https://git.kernel.org/stable/c/cc9d09fef78410bcd37ac05168cbd5f6dd75d3d2)

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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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