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Red Hat Openshift Virtualization 4 CVE-2026-6383

| EUVDEUVD-2026-23009 MEDIUM
Incorrect Authorization (CWE-863)
2026-04-15 redhat GHSA-j6cv-3w8p-vrg8
Authentication Bypass Red Hat Openshift Virtualization 4 Red Hat
5.4
CVSS 3.1 · Vendor: redhat
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Vulnerability Assessment

Weakness
CWE
CWE-863
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Authorization logic validation
MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 27, 2026

Authorization bypass in KubeVirt's RBAC evaluation logic allows authenticated users with specific custom roles to gain unauthorized access to subresources, potentially disclosing sensitive information or performing restricted actions. Additionally, legitimate users may be denied resource access. Exploitation requires prior authentication and the presence of custom RBAC roles; no active exploitation or public exploit code is known at time of analysis.

Affected Packages

go kubevirt.io/kubevirt no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in go

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (redhat) PRIMARY 5.4 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
SUSE MEDIUM
Red Hat 5.4 MEDIUM

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

2
Patch released
Apr 19, 2026 - 14:30 nvd
Patch available
CVE Published
Apr 15, 2026 - 18:22 nvd
MEDIUM 5.4

DescriptionCVE.org

A flaw was found in KubeVirt's Role-Based Access Control (RBAC) evaluation logic. The authorization mechanism improperly truncates subresource names, leading to incorrect permission evaluations. This allows authenticated users with specific custom roles to gain unauthorized access to subresources, potentially disclosing sensitive information or performing actions they are not permitted to do. Additionally, legitimate users may be denied access to resources.

Threat Intelligence Overview

EPSS Score
0.0%
Top 92% exploitable
Data Quality
6 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment MSRC Vendor

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +27
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:a:red_hat:red_hat_openshift_virtualization_4:*:*:*:*:*:*:*:*

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Symlink-based path traversal in the buildah/copier Go package allows a crafted tar archive to create files outside the i
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A path-handling flaw in the containers/storage Go library lets a crafted tar archive containing a malicious whiteout ent
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3.8 Jun 26

Unbounded memory allocation in KubeVirt's downward metrics virtio-serial server within Red Hat OpenShift Virtualization

Same weakness CWE-863 – Incorrect Authorization

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CVE-2025-32462 HIGH POC
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Same technique Authentication Bypass

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CVE-2013-2465 CRITICAL POC
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CVE-2022-40684 CRITICAL POC
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CVE-2024-0012 CRITICAL POC
9.3

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed
SUSE Linux Enterprise Micro 5.4 Fixed
SUSE Linux Enterprise Micro 5.5 Fixed
SUSE Linux Enterprise Module for Containers 15 SP7 Fixed

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-6383 REF https://access.redhat.com/security/cve/CVE-2026-6383 REF https://bugzilla.redhat.com/show_bug.cgi?id=2458741

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