# CVE-2025-47291: containerd CRI plugin: Incorrect cgroup hierarchy assignment for containers running in usernamespaced Kubernetes pods.

CVE-2025-47291 is fixed in containerd on 1 platform by containerd 2.0.5-0ubuntu1 (version 2.0.5-0ubuntu1), released May 21, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-47291
- Priority: High
- CVSS: 7.5 (Moderate)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2025
- Weakness: Incorrect Privilege Assignment
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-47291

## Description

containerd is an open-source container runtime. A bug was found in the containerd's CRI implementation where containerd, starting in version 2.0.1 and prior to version 2.0.5, doesn't put usernamespaced containers under the Kubernetes' cgroup hierarchy, therefore some Kubernetes limits are not honored. This may cause a denial of service of the Kubernetes node. This bug has been fixed in containerd 2.0.5+ and 2.1.0+. Users should update to these versions to resolve the issue. As a workaround, disable usernamespaced pods in Kubernetes temporarily.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | containerd Ubuntu 25.10 (questing) | 2.0.5-0ubuntu1 | [containerd 2.0.5-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-containerd-2.0.5-0ubuntu1.md) | May 21, 2025 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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