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CVE-2026-13322

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

Published: Jun 26, 2026Updated: Jul 6, 2026 Sources: CVE List NVDCWE-770
3.8LOW
NVD MITRE
EPSS Score
0.1%
Top 99.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:CC:NI:NA:L
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-770

Affected Products

Red Hat
commercial·USaka redhat
Red Hat OpenShift Virtualization 4SaaSSaaS Service
Cloud & SaaS / virtualization
openshift virtualizationOn-prem
Operating Systems / linux-distro
kubevirt
oss-projectaka containerized-data-importer, containerized data importer
kubevirtMixed
Cloud & SaaS / container-orchestration

Exploitability

Official Patch Available
Workaround Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

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

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