---
id: CVE-2021-41841
title: >-
  An issue was discovered in AhciBusDxe in the kernel 5.0 through 5.5 in Insyde
  InsydeH2O
summary: >-
  An issue was discovered in AhciBusDxe in the kernel 5.0 through 5.5 in Insyde
  InsydeH2O. There is an SMM callout that allows an attacker to access the
  System Management Mode and execute arbitrary code. This occurs because of
  Inclusion of…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-829
vendor: insyde
product: insydeh2o
affected:
  - 'insydeh2o >= 5.0, < 5.08.29'
  - 'insydeh2o >= 5.1, < 5.16.29'
  - 'insydeh2o >= 5.2, < 5.26.29'
  - 'insydeh2o >= 5.3, < 5.35.29'
  - 'insydeh2o >= 5.4, < 5.43.29'
  - 'insydeh2o >= 5.5, < 5.51.29'
patched:
  - insydeh2o 5.51.29
published: '2022-02-03'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-41841'
references:
  - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf'
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20220217-0012/'
    label: cve@mitre.org
  - url: 'https://www.insyde.com/security-pledge'
    label: cve@mitre.org
  - url: 'https://www.insyde.com/security-pledge/SA-2022019'
    label: cve@mitre.org
  - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20220217-0012/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.insyde.com/security-pledge'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.insyde.com/security-pledge/SA-2022019'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.kb.cert.org/vuls/id/796611'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-306654.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.00303
epssPercentile: 0.23226
ingestedAt: '2026-08-11T16:47:02.119Z'
---

## Overview

An issue was discovered in AhciBusDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. There is an SMM callout that allows an attacker to access the System Management Mode and execute arbitrary code. This occurs because of Inclusion of Functionality from an Untrusted Control Sphere.

## Affected

- `insydeh2o >= 5.0, < 5.08.29`
- `insydeh2o >= 5.1, < 5.16.29`
- `insydeh2o >= 5.2, < 5.26.29`
- `insydeh2o >= 5.3, < 5.35.29`
- `insydeh2o >= 5.4, < 5.43.29`
- `insydeh2o >= 5.5, < 5.51.29`

## Remediation

Upgrade past the affected range:

- `insydeh2o 5.51.29`