CVE-2026-6420
MediumCVSS 6.3Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A flaw was found in Keylime that allows an attacker with root access on an enrolled monitored machine to exploit a vulnerability in the Keylime verifier. The verifier uses a hardcoded challenge nonce instead of a cryptographically random value, enabling the attacker to stockpile valid TPM quotes and replay them to evade detection.
Risk Assessment
An attacker can exploit this vulnerability to hide their presence after compromising the system, posing a serious threat to the integrity and security of data within the organization.
Recommendation
It is recommended to update Keylime to the latest version to mitigate this vulnerability and implement additional security measures to monitor and detect unauthorized activities on systems.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS