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  <updated>2026-09-30T23:18:59.671019+00:00</updated>
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    <id>https://vulnerability.circl.lu/vuln/fkie_cve-2026-64676</id>
    <title>fkie_cve-2026-64676</title>
    <updated>2026-09-30T23:19:01.006008+00:00</updated>
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        <p>Kata Containers is an open source implementation of lightweight Virtual Machines (VMs) that perform like containers. In versions prior to 4.0.0, the kata-agent is vulnerable to an authorization bypass in confidential-guest memory management. In Confidential Containers (CoCo) deployments, the kata-agent enforces an OPA/Rego-based AgentPolicy that must authorize every ttRPC API call, forming the security boundary that prevents an untrusted host from directing the confidential guest. Two ttRPC methods introduced with the mem-agent feature are missing this authorization check, so an untrusted host can invoke them unconditionally regardless of the guest's policy configuration. When mem-agent is enabled (off by default), this lets the host tamper with in-guest memory management by forcing swap, aggressive eviction, or compaction, resulting in attacker-controlled availability and performance degradation of the confidential workload entirely outside the agent-policy boundary. The impact does not include memory disclosure or code execution, and severity is bounded by the precondition that mem-agent must be explicitly enabled. This issue is fixed in version 4.0.0.</p>
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    <link href="https://vulnerability.circl.lu/vuln/fkie_cve-2026-64676"/>
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