---
title: "CVE-2026-89617: Linux Kernel - Out of Bounds Read/Write"
description: "Linux kernel fs/ntfs3 contains a memory corruption vulnerability caused by lack of validation of dirty page table entries during log replay, letting attackers cause out-of-bounds memory access, exploit requires crafted NTFS log entries."
url: https://panop.io/threat-heartbeat/CVE-2026-89617/
---

# CVE-2026-89617 Linux Kernel - Out of Bounds Read/Write

Linux kernel fs/ntfs3 contains a memory corruption vulnerability caused by lack of validation of dirty page table entries during log replay, letting attackers cause out-of-bounds memory access, exploit requires crafted NTFS log entries.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.14% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89617)

## Details

Type

Out of Bounds Read/Write

Impact

Denial Of Service, Remote Code Execution

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 fs/ntfs3 dirty page table 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-2026-89617](https://nvd.nist.gov/vuln/detail/CVE-2026-89617)
- [https://git.kernel.org/stable/c/1e90b1703ee1a04cd3e9e399353fc536f5f3ba10](https://git.kernel.org/stable/c/1e90b1703ee1a04cd3e9e399353fc536f5f3ba10)
- [https://git.kernel.org/stable/c/d23155634a4bc1183e761d5eb2c043b2e693cc98](https://git.kernel.org/stable/c/d23155634a4bc1183e761d5eb2c043b2e693cc98)
- [https://git.kernel.org/stable/c/006cb7713dec10368e699abc4367e5faa334c9a5](https://git.kernel.org/stable/c/006cb7713dec10368e699abc4367e5faa334c9a5)
- [https://git.kernel.org/stable/c/0908da07c23be4f94b99dfd9a94765525f0fe4bd](https://git.kernel.org/stable/c/0908da07c23be4f94b99dfd9a94765525f0fe4bd)
- [https://git.kernel.org/stable/c/1200c2779c43b62656ccbb67df9468a7a9af2484](https://git.kernel.org/stable/c/1200c2779c43b62656ccbb67df9468a7a9af2484)
- [https://git.kernel.org/stable/c/2d94ffc9d7b5bb3517b129fe63b52d84bcd4ae56](https://git.kernel.org/stable/c/2d94ffc9d7b5bb3517b129fe63b52d84bcd4ae56)
- [https://git.kernel.org/stable/c/0e07ea2fc45a7b4757ef7bf1f692cc0180a08323](https://git.kernel.org/stable/c/0e07ea2fc45a7b4757ef7bf1f692cc0180a08323)

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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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