# CVE-2026-6420

## Summary

- **CVE ID:** CVE-2026-6420
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L)
- **CWE:** CWE-1241
- **Published:** May 6, 2026
- **Last Modified:** Aug 26, 2026

## Description

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.

## Affected Products

- Red Hat — Red Hat Enterprise Linux 10 (0:7.14.1-5.el10_2.1)
- Unknown product (7.14.0)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-6420)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2458889)
- [CNA](https://access.redhat.com/errata/RHSA-2026:28582)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.12%
- **EPSS Percentile:** 2.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._