3.8Low
CVE-2026-13322Kubevirt: virt-handler-rhel9: kubevirt: unbounded virtio-serial readline in virt-handler causes oom denial of service
Description
A flaw was found in KubeVirt's downward metrics virtio-serial server. The server reads guest requests using textproto.Reader.ReadLine(), which buffers input indefinitely until a newline character is received, with no length limit or read deadline. A user with access to a VM guest that has the downward metrics virtio-serial device configured can write a continuous byte stream to the device, causing unbounded memory allocation in the virt-handler process until it is OOM-killed.
Weakness (CWE):
CWE-770
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| kubevirt | kubevirt | — | |
| redhat | openshift virtualization | 4 – ≤ 4.22.0 | |
| Red Hat | Red Hat OpenShift Virtualization 4 | all versions |
References and patches
- https://access.redhat.com/security/cve/CVE-2026-13322 vdb-entryMitigationVendor Advisory
- RHBZ#2492681 issue-trackingIssue TrackingVendor Advisory
CPE matches (NVD) (2)
cpe:2.3:a:redhat:openshift_virtualization:*:*:*:*:*:*:*:*≥ 4 ≤ 4.22.0cpe:2.3:a:kubevirt:kubevirt:-:*:*:*:*:kubernetes:*:*