CVE-2026-6420

A flaw was found in Keylime. An attacker with root access on an enrolled monitored machine, where the Keylime agent runs, can exploit a vulnerability in the Keylime verifier. The verifier uses a hardcoded challenge nonce for Trusted Platform Module (TPM) quote attestation instead of a cryptographically random value. This allows the attacker to stockpile valid TPM quotes and replay them to evade detection after compromising the system. This issue affects only the push model deployment.

CVSS v3 6.3 MEDIUM

6.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 0.8 / Impact : 5.5

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:28582
https://access.redhat.com/security/cve/CVE-2026-6420
https://bugzilla.redhat.com/show_bug.cgi?id=2458889

Configurations

No configuration.

History

26 Oct 2026, 19:10

Type	Values Removed	Values Added
Summary		(es) Se encontró un fallo en Keylime. Un atacante con acceso de root en una máquina monitoreada registrada, donde se ejecuta el agente de Keylime, puede explotar una vulnerabilidad en el verificador de Keylime. El verificador utiliza un nonce de desafío codificado para la atestación de cita del Módulo de Plataforma Confiable (TPM) en lugar de un valor criptográficamente aleatorio. Esto permite al atacante acumular citas TPM válidas y reproducirlas para evadir la detección después de comprometer el sistema. Este problema afecta solo al despliegue del modelo push.

Information

Published : 2026-05-06 11:16

Updated : 2026-10-26 19:10

NVD link : CVE-2026-6420

Mitre link : CVE-2026-6420

CVE.ORG link : CVE-2026-6420

JSON object : View

Products Affected

No product.

CWE

CWE-1241

Use of Predictable Algorithm in Random Number Generator

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