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CVE-2026-64676— Kata Containers: Unauthorized mem-agent ttRPC methods let an untrusted host tamper with confidential-guest memory

Quick assessment

Affected
kata-containers kata-containers
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Formidable Forms是WordPress基金会开源的一款表单创建插件。 Kata Containers 4.0.0之前版本存在授权问题漏洞，该漏洞源于机密客户机内存管理中的授权绕过，mem-agent功能引入的两个ttRPC方法缺少授权检查，可能导致不可信主机无条件调用它们，强制swap、激进回收或压缩，造成机密工作负载的可用性和性能下降。

CVSS 5.7 · Medium EPSS 0.12% · P2

Affected Version Matrix 1

VendorProduct Version RangeStatus
kata-containers kata-containers < 4.0.0 affected
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I. Basic Information for CVE-2026-64676

Vulnerability Information
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Vulnerability Title
Kata Containers: Unauthorized mem-agent ttRPC methods let an untrusted host tamper with confidential-guest memory
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Kata Containers 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Formidable Forms是WordPress基金会开源的一款表单创建插件。 Kata Containers 4.0.0之前版本存在授权问题漏洞，该漏洞源于机密客户机内存管理中的授权绕过，mem-agent功能引入的两个ttRPC方法缺少授权检查，可能导致不可信主机无条件调用它们，强制swap、激进回收或压缩，造成机密工作负载的可用性和性能下降。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kata-containers kata-containers < 4.0.0 -

II. Public POCs for CVE-2026-64676

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III. Intelligence Information for CVE-2026-64676

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Vendor Advisories for CVE-2026-64676 (1)

Same Patch Batch · kata-containers · 2026-08-07 · 3 CVEs total

CVE-2026-50540 9.6 CRITICAL Kata Containers: Config Path Annotation Arbitrary File Loading
CVE-2026-47243 9.2 CRITICAL Kata guest escape: runtime-rs guest-root to host-root escape via virtiofs

IV. Related Vulnerabilities

Same product: kata-containers
Same vendor: kata-containers
Same weakness: CWE-862

V. Comments for CVE-2026-64676

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