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{"acknowledgement": "This issue was discovered by Huzaifa Sidhpurwala (Red Hat).", "bugzilla": {"description": "kubevirt: virt-handler-rhel9: kubevirt: virt-handler migration proxy follows symlinks allowing container escape to host", "id": "2494142", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2494142"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-22", "details": ["A symlink following vulnerability was found in KubeVirt's virt-handler migration proxy. During live migration, virt-handler dials Unix sockets inside the target virt-launcher pod via /proc/<pid>/root/ paths using net.Dial() without symlink protection. These socket paths reside in qemu-owned directories writable by the virt-launcher user. An attacker with namespace edit and pods/exec permissions can replace a migration proxy socket with a symlink to the host CRI-O socket. Because virt-handler runs as root in the host mount namespace, absolute symlink targets resolve against the host filesystem, and the bidirectional io.Copy proxy relays attacker-controlled bytes to the container runtime, enabling full node compromise."], "mitigation": {"lang": "en:us", "value": "Restrict pods/exec permissions in namespaces that run virtual machines. The pods/exec RBAC permission is required for the attack \u2014 removing it from VM operator roles prevents exploitation. \nAdditionally, enable Kubernetes audit logging and monitor for kubectl exec commands targeting virt-launcher pods, especially during live migration events."}, "name": "CVE-2026-13622", "package_state": [{"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Affected", "package_name": "container-native-virtualization/virt-handler", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Affected", "package_name": "container-native-virtualization/virt-handler-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}], "public_date": "2026-08-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-13622\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-13622"], "statement": "Red Hat has rated this vulnerability as Important impact. The vulnerable code is in the virt-handler component, a privileged DaemonSet running as root in the host mount namespace on every compute node. Its migration proxy dials Unix sockets inside target virt-launcher pods via /proc/<pid>/root/ using net.Dial(), which follows symbolic links. Because virt-handler operates in the host mount namespace, absolute symlink targets resolve against the host root filesystem, enabling container-to-host escape.\nExploitation requires an authenticated user with namespace-level edit permissions (kubevirt.io:edit) and pods/exec access \u2014 standard permissions for VM operators. The impact of successful exploitation is complete node compromise via CRI-O socket access, bypassing all Kubernetes admission controls.", "threat_severity": "Important"}

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