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CVE-2026-6420— Keylime: keylime: security bypass due to hardcoded tpm quote nonce

Quick assessment

Affected
CVE-2026-6420
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Keylime是Keylime开源的一个利用 TPM 技术的开源可扩展信任系统。 Keylime存在安全漏洞，该漏洞源于验证器使用硬编码的挑战随机数进行TPM引用证明而非加密随机值，可能导致攻击者囤积有效TPM引用并重放以逃避检测。

CVSS 6.3 · Medium EPSS 0.18% · P6

Possible ATT&CK Techniques 2 AI

T1078 · Valid Accounts T1562

Affected Version Matrix 3

VendorProduct Version RangeStatus
None None 7.14.0< 7.14.2 affected
Red Hat Red Hat Enterprise Linux 10 0:7.14.1-5.el10_2.1< * unaffected
Red Hat Red Hat Enterprise Linux 9 any affected

I. Basic Information for CVE-2026-6420

Vulnerability Information
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Vulnerability Title
Keylime: keylime: security bypass due to hardcoded tpm quote nonce
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1241
Source: CVE Program / CVE List V5
Vulnerability Title
Keylime 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keylime是Keylime开源的一个利用 TPM 技术的开源可扩展信任系统。 Keylime存在安全漏洞，该漏洞源于验证器使用硬编码的挑战随机数进行TPM引用证明而非加密随机值，可能导致攻击者囤积有效TPM引用并重放以逃避检测。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 7.14.0 ~ 7.14.2 -
Red Hat Red Hat Enterprise Linux 10 0:7.14.1-5.el10_2.1 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-6420

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III. Intelligence Information for CVE-2026-6420

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Vendor Advisories for CVE-2026-6420 (2)

Other References for CVE-2026-6420 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1241

V. Comments for CVE-2026-6420

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