---
title: "CVE-2026-90199: Linux Kernel - Improper Input Validation"
description: "Linux kernel contains a vulnerability in fs/ntfs3 where improper validation of evcn in mi_enum_attr() allows malformed on-disk attributes to bypass checks due to evcn wraparound, letting attackers cause potential data corruption or denial of service, exploit requires crafted malformed NTFS attributes."
url: https://panop.io/threat-heartbeat/CVE-2026-90199/
---

# CVE-2026-90199 Linux Kernel - Improper Input Validation

Linux kernel contains a vulnerability in fs/ntfs3 where improper validation of evcn in mi\_enum\_attr() allows malformed on-disk attributes to bypass checks due to evcn wraparound, letting attackers cause potential data corruption or denial of service, exploit requires crafted malformed NTFS attributes.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90199)

## Details

Type

Improper Input Validation

Impact

Denial Of Service, Data Tampering

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 the evcn 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-2026-90199](https://nvd.nist.gov/vuln/detail/CVE-2026-90199)
- [https://git.kernel.org/stable/c/0441e34ce098c19185a7b52c5b8b89a8a5b26888](https://git.kernel.org/stable/c/0441e34ce098c19185a7b52c5b8b89a8a5b26888)
- [https://git.kernel.org/stable/c/20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3](https://git.kernel.org/stable/c/20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3)
- [https://git.kernel.org/stable/c/2b9a0e57bfd365e2096706b19ae34dce3b4a884b](https://git.kernel.org/stable/c/2b9a0e57bfd365e2096706b19ae34dce3b4a884b)
- [https://git.kernel.org/stable/c/7ab69cef49ebdfee288287d62641b24ab1445ecc](https://git.kernel.org/stable/c/7ab69cef49ebdfee288287d62641b24ab1445ecc)
- [https://git.kernel.org/stable/c/ce9a619c432b9a4044fee115c5483fbed946c131](https://git.kernel.org/stable/c/ce9a619c432b9a4044fee115c5483fbed946c131)

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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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