CVE-2026-24834 in Kata Containers
Summary
by MITRE • 02/19/2026
Kata Containers is an open source project focusing on a standard implementation of lightweight Virtual Machines (VMs) that perform like containers. In versions prior to 3.27.0, an issue in Kata with Cloud Hypervisor allows a user of the container to modify the file system used by the Guest micro VM ultimately achieving arbitrary code execution as root in said VM. The current understanding is this doesn’t impact the security of the Host or of other containers / VMs running on that Host (note that arm64 QEMU lacks NVDIMM read-only support: It is believed that until the upstream QEMU gains this capability, a guest write could reach the image file). Version 3.27.0 patches the issue.
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Analysis
by VulDB Data Team • 02/19/2026
The vulnerability identified as CVE-2026-24834 affects Kata Containers, an open source project designed to provide lightweight virtual machines that operate with container-like performance characteristics. This security flaw exists within the integration between Kata Containers and the Cloud Hypervisor component, specifically impacting versions prior to 3.27.0. The issue represents a significant privilege escalation vulnerability that allows container users to manipulate the guest micro VM's file system, ultimately enabling arbitrary code execution with root privileges within that specific virtual environment.
The technical flaw stems from inadequate file system access controls within the Cloud Hypervisor integration layer of Kata Containers. Attackers with container-level privileges can exploit this weakness to modify the guest VM's file system contents, creating a path for privilege escalation that results in root-level code execution within the guest environment. This vulnerability operates at the hypervisor level where container users can potentially bypass normal security boundaries that typically protect the host system and other running containers. The flaw specifically relates to how file system mounts and access permissions are handled between the container runtime and the underlying virtualization layer, creating an attack surface that allows for unauthorized modification of critical system files.
The operational impact of this vulnerability extends beyond simple privilege escalation as it fundamentally undermines the security isolation that virtual machines are designed to provide. While the vulnerability does not directly compromise host system security or affect other containers running on the same host, it creates a dangerous scenario where a compromised container can gain complete control over its assigned virtual machine. This represents a violation of the principle of least privilege and could enable attackers to establish persistent access within the guest environment, potentially using it as a foothold for further attacks. The vulnerability is particularly concerning in multi-tenant environments where container isolation is critical for maintaining security boundaries between different users or applications.
The fix implemented in version 3.27.0 addresses this issue by strengthening file system access controls and implementing proper isolation mechanisms between container users and guest VM file systems. This patch resolves the specific flaw in Cloud Hypervisor integration that allowed unauthorized file system modifications. Organizations should immediately upgrade to Kata Containers version 3.27.0 or later to remediate this vulnerability. The mitigation strategy should also include monitoring for suspicious file system modifications within guest environments and implementing additional runtime security controls. This vulnerability aligns with CWE-276, which deals with incorrect permissions for critical resources, and maps to ATT&CK technique T1059 for command and scripting interpreter, as the privilege escalation could enable attackers to execute arbitrary code within the compromised guest environment. The issue also relates to ATT&CK technique T1068, which covers local privilege escalation through weaknesses in system design or implementation, and represents a clear violation of the principle of defense in depth that should protect virtualized environments from lateral movement attacks.