---
title: "CVE-2026-89782: Linux kernel fs/ntfs3 - Use After Free"
description: "Linux kernel fs/ntfs3 contains a use-after-free vulnerability caused by improper handling of restart table growth beyond U16_MAX entries during $LogFile replay, letting attackers cause out-of-bounds memory access, exploit requires mounting a crafted NTFS image."
url: https://panop.io/threat-heartbeat/CVE-2026-89782/
---

# CVE-2026-89782 Linux kernel fs/ntfs3 - Use After Free

Linux kernel fs/ntfs3 contains a use-after-free vulnerability caused by improper handling of restart table growth beyond U16\_MAX entries during $LogFile replay, letting attackers cause out-of-bounds memory access, exploit requires mounting a crafted NTFS image.

CVSS base score 8.4 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.19% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89782)

## Details

Type

Use After Free

Impact

Denial Of Service, Remote Code Execution

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for restart table growth validation in fs/ntfs3.

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-2026-89782](https://nvd.nist.gov/vuln/detail/CVE-2026-89782)
- [https://git.kernel.org/stable/c/967a5ff8a614d10126b6d46db1ac040948d6cb42](https://git.kernel.org/stable/c/967a5ff8a614d10126b6d46db1ac040948d6cb42)
- [https://git.kernel.org/stable/c/aad605a450611e2a7b7cf9dd5724004d39192bfb](https://git.kernel.org/stable/c/aad605a450611e2a7b7cf9dd5724004d39192bfb)
- [https://git.kernel.org/stable/c/be218a01aadffe33ed4fc73e25276d676ebbd09d](https://git.kernel.org/stable/c/be218a01aadffe33ed4fc73e25276d676ebbd09d)
- [https://git.kernel.org/stable/c/caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56](https://git.kernel.org/stable/c/caa0ec3fc44a13d7c21d78e4722f4f05f87ccf56)
- [https://git.kernel.org/stable/c/ecde45cd81dc28f5696c312c5ce5a509962e9ab1](https://git.kernel.org/stable/c/ecde45cd81dc28f5696c312c5ce5a509962e9ab1)
- [https://git.kernel.org/stable/c/111f8d74a19d85942ecbb3aba78f6f3c88e59391](https://git.kernel.org/stable/c/111f8d74a19d85942ecbb3aba78f6f3c88e59391)
- [https://git.kernel.org/stable/c/339e59996ff193adcf1c438cf05f19e753beb3a7](https://git.kernel.org/stable/c/339e59996ff193adcf1c438cf05f19e753beb3a7)

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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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