{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64676", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-20T17:12:12.891Z", "datePublished": "2026-08-07T21:47:20.584Z", "dateUpdated": "2026-08-07T21:47:20.584Z"}, "containers": {"cna": {"title": "Kata Containers: Unauthorized mem-agent ttRPC methods let an untrusted host tamper with confidential-guest memory", "problemTypes": [{"descriptions": [{"cweId": "CWE-862", "lang": "en", "description": "CWE-862: Missing Authorization", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/kata-containers/kata-containers/security/advisories/GHSA-h8jv-63p2-496x", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/kata-containers/kata-containers/security/advisories/GHSA-h8jv-63p2-496x"}], "affected": [{"vendor": "kata-containers", "product": "kata-containers", "versions": [{"version": "< 4.0.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-07T21:47:20.584Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-h8jv-63p2-496x", "discovery": "UNKNOWN"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.0.0)"}}], "enrichment": {"confidence": 98.0, "confidence_source": "matching", "scores": [{"score": 98.0, "source": "matching"}]}, "original": {"product": "kata-containers", "source": "cna", "vendor": "kata-containers"}, "product": "kata-containers", "vendor": "katacontainers"}], "created": "2026-08-07T23:30:17.651094+00:00", "updated": "2026-08-08T01:30:02.938435+00:00", "vendors": ["katacontainers", "katacontainers$PRODUCT$kata-containers"]}