CVE-2026-6420
Keylime: keylime: security bypass due to hardcoded tpm quote nonce
- State
- Published
- Severity
- 6.3 Medium
- Published
- May 6, 2026
- Updated
- Aug 26, 2026
- Reserved
- Apr 16, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.3 Medium | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L | redhat |
Weaknesses
- CWE-1241 Use of Predictable Algorithm in Random Number Generator
Affected Products
| Product | Versions |
|---|---|
keylime |
|
Red Hat Enterprise Linux 10Red Hat |
|
Red Hat Enterprise Linux 9Red Hat |
References
- RHSA-2026:28582vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-6420vdb-entry
- RHBZ#2458889issue-tracking
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