CVE-2025-4563
Description
A flaw was found in the Kubernetes NodeRestriction admission controller when the DynamicResourceAllocation feature is enabled. While this controller properly validates resource claims during pod status updates, it fails to apply the same validation during pod creation. This oversight allows a compromised node to create mirror pods that can access unauthorized dynamic resources, potentially leading to unauthorized data access and privilege escalation. Although kubelet sanity checks usually prevent such pods from running, the lack of authorization enforcement at creation time poses a real security policy failure.
Statement
Red Hat Product Security has assessed the severity of this vulnerability as Low due to its limited preconditions and mitigated runtime impact. While successful exploitation requires a compromised node, the vulnerability enables that node to bypass API authorization checks and gain access to unauthorized dynamic resources. This represents a serious policy enforcement gap. Although kubelet checks often prevent affected pods from running, the underlying flaw allows violation of Kubernetes’ access control boundaries.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 2.7 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | High | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | Low | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
Acknowledgements
Red Hat would like to thank Amit Schendel for reporting this issue.
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