CVE-2026-6420 — Keylime Vulnerability

title: CVE-2026-6420 - Keylime Verifier Hardcoded Challenge Nonce Replay
id: scw-2026-05-06-ai-1
status: experimental
level: high
description: |
  Detects the exploitation of CVE-2026-6420 by identifying the Keylime agent process being executed with root privileges, potentially initiated via sudo, and specifically looking for command-line arguments related to TPM quote attestation. This indicates an attacker with root access attempting to exploit the hardcoded challenge nonce vulnerability to stockpile and replay TPM quotes.
author: SCW Feed Engine (AI-generated)
date: 2026-05-06
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-6420/
tags:
  - attack.privilege_escalation
  - attack.t1548.002
logsource:
    category: process_creation
detection:
  selection:
      Image|endswith:
          - 'keylime_agent'
      CommandLine|contains:
          - 'tpm_quote_attestation'
      ParentImage|contains:
          - '/usr/bin/sudo'
      User|contains:
          - 'root'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse