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CVE-2026-6383— Kubevirt: kubevirt: unauthorized subresource access due to improper rbac evaluation

Quick assessment

Affected
Red Hat Red Hat OpenShift Virtualization 4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kubevirt是KubeVirt开源的一款虚拟机管理器。 KubeVirt存在安全漏洞，该漏洞源于基于角色的访问控制评估逻辑不当截断子资源名称，可能导致未经授权的访问或拒绝合法用户访问。

CVSS 5.4 · Medium EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-6383

Vulnerability Information
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Vulnerability Title
Kubevirt: kubevirt: unauthorized subresource access due to improper rbac evaluation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Kubevirt 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubevirt是KubeVirt开源的一款虚拟机管理器。 KubeVirt存在安全漏洞，该漏洞源于基于角色的访问控制评估逻辑不当截断子资源名称，可能导致未经授权的访问或拒绝合法用户访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat OpenShift Virtualization 4 - cpe:/a:redhat:container_native_virtualization:4

II. Public POCs for CVE-2026-6383

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III. Intelligence Information for CVE-2026-6383

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Vendor Advisories for CVE-2026-6383 (2)

Same Patch Batch · Red Hat · 2026-04-15 · 10 CVEs total

CVE-2026-6388 9.1 CRITICAL Argocd-image-updater: argocd image updater: cross-namespace privilege escalation via insuf
CVE-2026-6384 7.3 HIGH Gimp: gimp: arbitrary code execution or denial of service via buffer overflow in gif image
CVE-2026-6385 6.5 MEDIUM Ffmpeg: ffmpeg: denial of service and potential arbitrary code execution via signed intege
CVE-2026-40919 6.1 MEDIUM Gimp: gimp: denial of service via specially crafted seattle filmworks file
CVE-2026-6245 5.5 MEDIUM Sssd: out-of-bounds read in the sssd
CVE-2026-40915 5.5 MEDIUM Gimp: gimp: heap buffer overflow due to integer overflow in fits image loader
CVE-2026-40918 5.5 MEDIUM Gimp: gimp: denial of service via crafted pvr image file
CVE-2026-40916 5.0 MEDIUM Gimp: gimp: denial of service due to stack buffer overflow in tim image loader
CVE-2026-40917 5.0 MEDIUM Gimp: gimp: application crashes or information disclosure via crafted icns image files

IV. Related Vulnerabilities

Same product: Red Hat OpenShift Virtualization 4
Same vendor: Red Hat
Same weakness: CWE-863

V. Comments for CVE-2026-6383

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