Vulnerability · Published May 6, 2026 · Assigned by redhat
CVE-2026-6420Keylime: keylime: security bypass due to hardcoded tpm quote nonce
Medium 6.3
In plain English
A medium-severity security flaw in keylime. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | keylime | 7.14.1-5.el10_2.1 | ALSA-2026:28582 |
| AlmaLinux:10 | keylime-base | 7.14.1-5.el10_2.1 | ALSA-2026:28582 |
| AlmaLinux:10 | keylime-registrar | 7.14.1-5.el10_2.1 | ALSA-2026:28582 |
| AlmaLinux:10 | keylime-selinux | 7.14.1-5.el10_2.1 | ALSA-2026:28582 |
| AlmaLinux:10 | keylime-tenant | 7.14.1-5.el10_2.1 | ALSA-2026:28582 |
| AlmaLinux:10 | keylime-tools | 7.14.1-5.el10_2.1 | ALSA-2026:28582 |
| AlmaLinux:10 | keylime-verifier | 7.14.1-5.el10_2.1 | ALSA-2026:28582 |
| AlmaLinux:10 | python3-keylime | 7.14.1-5.el10_2.1 | ALSA-2026:28582 |
| PyPI | keylime | 7.14.2 | GHSA-q8w6-w55c-ccv5 |
| PyPI | keylime | 7.14.2 | PYSEC-2026-2548 |
| Rocky Linux:10 | keylime | 0:7.14.1-5.el10_2.1 | RLSA-2026:28582 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| keylime | 7.14.0 – before 7.14.2 | |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
Weakness: CWE-1241 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L
References
- RHSA-2026:28582 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-6420 vdb-entry, x_refsource_REDHAT
- RHBZ#2458889 issue-tracking, x_refsource_REDHAT