Kata Containers: Unauthorized mem-agent ttRPC methods let an untrusted host tamper with confidential-guest memory
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| kata-containers | kata-containers | affected |
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| Katacontainers | Kata-containers |
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No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.175% probability within 30 days)
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ssvc
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| First Time appeared |
Katacontainers
Katacontainers kata-containers |
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| Vendors & Products |
Katacontainers
Katacontainers kata-containers |
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| Description | 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. | |
| Title | Kata Containers: Unauthorized mem-agent ttRPC methods let an untrusted host tamper with confidential-guest memory | |
| Weaknesses | CWE-862 | |
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| Metrics |
cvssV3_1
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