CVE-2026-13322 — Kubevirt: virt-handler-rhel9: kubevirt: unbounded virtio-serial readline in virt-handler causes oom denial of service

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Red Hat / Red Hat OpenShift Virtualization 4	affected
Red Hat / Red Hat OpenShift Virtualization 4	affected

CWE

CWE-770

References

https://access.redhat.com/security/cve/CVE-2026-13322
https://bugzilla.redhat.com/show_bug.cgi?id=2492681

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.