CVE-2026-13218

A flaw was found in KubeVirt's virt-handler network cache handling. The WriteToCachedFile function writes data to a launcher-rooted path using os.WriteFile and os.Chown without symlink protection. A user with access to the virt-launcher container can plant a symlink at the cache file path, causing virt-handler to follow it and overwrite an arbitrary host file with JSON content and change its ownership.

CVSS v3 4.2 MEDIUM

4.2^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.1 / Impact : 2.7

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact LOW

Scope CHANGED

References

Link	Resource
https://access.redhat.com/security/cve/CVE-2026-13218	Vendor Advisory Mitigation
https://bugzilla.redhat.com/show_bug.cgi?id=2492654	Issue Tracking Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:kubevirt:kubevirt:-:::::kubernetes::
	cpe:2.3:a:redhat:openshift_virtualization::::::::

History

25 Oct 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) Se encontró una vulnerabilidad en el manejo de la caché de red del virt-gestor de KubeVirt. La función WriteToCachedFile escribe datos en una ruta con raíz en el lanzador utilizando os.WriteFile y os.Chown sin protección contra enlaces simbólicos. Un usuario con acceso al contenedor virt-launcher puede colocar un enlace simbólico en la ruta del archivo de caché, haciendo que el virt-gestor lo siga y sobrescriba un archivo de host arbitrario con contenido JSON y cambie su propiedad.

Information

Published : 2026-06-26 00:16

Updated : 2026-10-25 22:10

NVD link : CVE-2026-13218

Mitre link : CVE-2026-13218

CVE.ORG link : CVE-2026-13218

JSON object : View

Products Affected

kubevirt

kubevirt

redhat

openshift_virtualization

CWE

CWE-61

UNIX Symbolic Link (Symlink) Following

{"id": "CVE-2026-13218", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-13218", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-26T14:58:08.187830Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secalert@redhat.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 4.2, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 2.7, "exploitabilityScore": 1.1}]}, "affected": [{"source": "secalert@redhat.com", "affectedData": [{"cpes": ["cpe:/a:redhat:container_native_virtualization:4"], "vendor": "Red Hat", "product": "Red Hat OpenShift Virtualization 4", "packageName": "container-native-virtualization/virt-handler", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:container_native_virtualization:4"], "vendor": "Red Hat", "product": "Red Hat OpenShift Virtualization 4", "packageName": "container-native-virtualization/virt-handler-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}]}], "published": "2026-06-26T00:16:51.147", "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-13218", "tags": ["Vendor Advisory", "Mitigation"], "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492654", "tags": ["Issue Tracking", "Vendor Advisory"], "source": "secalert@redhat.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-61"}]}], "descriptions": [{"lang": "en", "value": "A flaw was found in KubeVirt's virt-handler network cache handling. The WriteToCachedFile function writes data to a launcher-rooted path using os.WriteFile and os.Chown without symlink protection. A user with access to the virt-launcher container can plant a symlink at the cache file path, causing virt-handler to follow it and overwrite an arbitrary host file with JSON content and change its ownership."}, {"lang": "es", "value": "Se encontr\u00f3 una vulnerabilidad en el manejo de la cach\u00e9 de red del virt-gestor de KubeVirt. La funci\u00f3n WriteToCachedFile escribe datos en una ruta con ra\u00edz en el lanzador utilizando os.WriteFile y os.Chown sin protecci\u00f3n contra enlaces simb\u00f3licos. Un usuario con acceso al contenedor virt-launcher puede colocar un enlace simb\u00f3lico en la ruta del archivo de cach\u00e9, haciendo que el virt-gestor lo siga y sobrescriba un archivo de host arbitrario con contenido JSON y cambie su propiedad."}], "lastModified": "2026-10-25T22:10:00.150", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:kubevirt:kubevirt:-:*:*:*:*:kubernetes:*:*", "vulnerable": true, "matchCriteriaId": "06AF9668-6158-47F4-A755-0EE4D5F7F413"}, {"criteria": "cpe:2.3:a:redhat:openshift_virtualization:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5301905C-9B5C-479F-A69A-659C6CB3AA42", "versionEndIncluding": "4.22.0", "versionStartIncluding": "4"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}