---
title: "CVE-2026-90133: Linux Kernel ntfs - Out of Bounds Write"
description: "Linux kernel ntfs subsystem contains a heap out-of-bounds write caused by lack of bounds checking in ntfs_ir_to_ib() when copying index_root entries, letting attackers trigger memory corruption via crafted filesystem images, exploit requires crafted filesystem."
url: https://panop.io/threat-heartbeat/CVE-2026-90133/
---

# CVE-2026-90133 Linux Kernel ntfs - Out of Bounds Write

Linux kernel ntfs subsystem contains a heap out-of-bounds write caused by lack of bounds checking in ntfs\_ir\_to\_ib() when copying index\_root entries, letting attackers trigger memory corruption via crafted filesystem images, exploit requires crafted filesystem.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.21% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90133)

## Details

Type

Out of Bounds Write

Impact

Denial Of Service

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for ntfs\_ir\_to\_ib() heap OOB write.

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-2026-90133](https://nvd.nist.gov/vuln/detail/CVE-2026-90133)
- [https://git.kernel.org/stable/c/825dec5120933e90c54e30e31ccfa6c3449043a8](https://git.kernel.org/stable/c/825dec5120933e90c54e30e31ccfa6c3449043a8)
- [https://git.kernel.org/stable/c/dc09bf79b76f9a7157e225f449655f3f62f96c9c](https://git.kernel.org/stable/c/dc09bf79b76f9a7157e225f449655f3f62f96c9c)

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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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