CVE-2026-13322
Kubevirt: virt-handler-rhel9: kubevirt: unbounded virtio-serial readline in virt-handler causes oom denial of service
CVSS Score
3.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Vendor | red hat |
| Product | red hat openshift virtualization 4 |
| Published | Jun 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
Red Hat / Red Hat OpenShift Virtualization 4
All versions affected Red Hat / Red Hat OpenShift Virtualization 4
All versions affected References
Credits
This issue was discovered by Huzaifa Sidhpurwala (Red Hat).