Confidential-guest service degradation via ungated ttRPC methods
Published Aug 7, 2026 · Updated Aug 7, 2026
Authorization bypass in Kata Containers before 4.0.0 allows attackers to degrade confidential-guest availability through mem-agent ttRPC. Two mem-agent ttRPC handlers in kata-agent execute memory-management requests without the OPA/Rego AgentPolicy authorization check applied to other agent calls. Exploitation requires a Confidential Containers deployment with mem-agent explicitly enabled; the host can force swap, eviction, or compaction, but cannot disclose memory or execute code.
Summary
What happened
Authorization bypass in Kata Containers before 4.0.0 allows attackers to degrade confidential-guest availability through mem-agent ttRPC. Two mem-agent ttRPC handlers in kata-agent execute memory-management requests without the OPA/Rego AgentPolicy authorization check applied to other agent calls. Exploitation requires a Confidential Containers deployment with mem-agent explicitly enabled; the host can force swap, eviction, or compaction, but cannot disclose memory or execute code.
The record
- CVE
- CVE-2026-64676
- Published
- Aug 7, 2026
- Updated
- Aug 7, 2026
- Vendor
- Kata Containers
- Product
- Kata Containers
- Classifications
- CWE-862, T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 7, 2026CVE publishedPublication date reported by the CVE source.
- Aug 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 4.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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