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Critical MSRC-CVE-2025-59291 1 CVE

Confidential Azure Container Instances Elevation of Privilege Vulnerability

Published Oct 14, 2025 · Updated Oct 14, 2025

Summary

Impact: Elevation of Privilege. Microsoft rating: Critical. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

How could an attacker exploit this vulnerability?
An attacker could trick the system into mounting a malicious file share to a sensitive location, allowing them to run harmful code.

What privileges could be gained by an attacker who successfully exploited the vulnerability?
The attacker could gain code execution within the confidential ACI sidecar container, escalating from host control to confidential containers.

According to the CVSS metric, successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability?
A successful attack allows the container host to execute code in the targeted guest environment.

What actions need to be taken to mitigate this vulnerability?
To ensure secure and compliant use of Confidential virtual nodes on Azure Container Instances, customers must take the following actions:
If you are using Confidential virtual nodes, update to Helm chart version 1.3012.25080101 or later., Follow the deployment instructions provided in the https://github.com/microsoft/virtualnodesOnAzureContainerInstances repository.
If you are using Confidential ACI or Confidential virtual nodes, you must regenerate your Confidential Compute Environment (CCE) policy with a minimum infrastructure fragment SVN of 4.
To do this:
*az extension update --name confcomShow more lines*
Alternatively, you can manually set the infrastructure SVN using:
*--infrastructure-svn 4*

Vulnerabilities 1

  • High 8.2

    Confidential Azure Container Instances Elevation of Privilege Vulnerability

    External control of file name or path in Confidential Azure Container Instances allows an authorized attacker to elevate privileges locally.

Revision history

  1. #1

    Information published.

References