Advisory on CrackArmor Vulnerability
On March 19, 2026, Ubuntu disclosed several vulnerabilities affecting Managed Kubernetes node images.
These vulnerabilities, known collectively as CrackArmor, allow an attacker with code execution inside a container running on an affected node to escape the container boundary. The attacker could then gain access to the underlying host operating system.
These vulnerabilities are classified as High severity with the following CVSS scores:
Impacted IONOS CLOUD products
Risk on IONOS CLOUD user environment
Workloads running in containers on affected Managed Kubernetes nodes were at risk of container escape. An attacker with code execution inside a container could potentially break out to the host node and access resources outside their intended boundary.
What action has IONOS CLOUD taken to mitigate the vulnerability?
IONOS CLOUD has applied updated Managed Kubernetes node images across all regions.
What action can you take to mitigate the vulnerability?
No action is required. Updated node images are applied automatically during your node pool's scheduled maintenance window.
How can I get help?
If you have further questions or concerns about this vulnerability, contact IONOS CLOUD Support.
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