Red Hat OpenShift Virtualization 4 textproto.Reader.ReadLine allocation of resources

Summaryinfo

A vulnerability, which was classified as critical, was found in Red Hat OpenShift Virtualization 4. Affected by this vulnerability is the function textproto.Reader.ReadLine. Executing a manipulation can lead to allocation of resources. This vulnerability is registered as CVE-2026-13322. The attack needs to be launched locally. No exploit is available.

Detailsinfo

A vulnerability was found in Red Hat OpenShift Virtualization 4. It has been declared as critical. This vulnerability affects the function textproto.Reader.ReadLine. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is available at access.redhat.com. This vulnerability was named CVE-2026-13322 since 06/25/2026. The exploitation appears to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 06/26/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Virtualization Software

Vendor

• Red Hat

Name

• OpenShift Virtualization

Version

• 4

License

• open-source

Website

• Vendor: https://www.redhat.com/

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