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Linux Distros Unpatched Vulnerability : CVE-2026-6420

medium Nessus Plugin ID 312583

Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - 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. (CVE-2026-6420)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-6420

Plugin Details

Severity: Medium

ID: 312583

File Name: unpatched_CVE_2026_6420.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Misc.

Published: 5/6/2026

Updated: 5/7/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.0

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 5.3

Vector: CVSS2#AV:L/AC:L/Au:M/C:C/I:C/A:P

CVSS Score Source: CVE-2026-6420

CVSS v3

Risk Factor: Medium

Base Score: 6.3

Temporal Score: 5.8

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:keylime, p-cpe:/a:redhat:enterprise_linux:keylime-base, p-cpe:/a:redhat:enterprise_linux:keylime-registrar, p-cpe:/a:redhat:enterprise_linux:keylime-selinux, p-cpe:/a:redhat:enterprise_linux:keylime-tenant, p-cpe:/a:redhat:enterprise_linux:keylime-verifier, p-cpe:/a:redhat:enterprise_linux:python3-keylime, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:redhat:enterprise_linux:keylime-tools

Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 5/6/2026

Reference Information

CVE: CVE-2026-6420