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Linux Distros Unpatched Vulnerability : CVE-2026-23893

medium Nessus Plugin ID 297680

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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.

 - openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. Versions 2.3.2 and above are vulnerable to symlink-following when running in privileged contexts. A token-group user can redirect file operations to arbitrary filesystem targets by planting symlinks in group-writable token directories, resulting in privilege escalation or data exposure. Token and lock directories are 0770 (group-writable for token users), so any token-group member can plant files and symlinks inside them. When run as root, the base code handling token directory file access, as well as several openCryptoki tools used for administrative purposes, may reset ownership or permissions on existing files inside the token directories. An attacker with token-group membership can exploit the system when an administrator runs a PKCS#11 application or administrative tool that performs chown on files inside the token directory during normal maintenance. This issue is fixed in commit 5e6e4b4, but has not been included in a released version at the time of publication. (CVE-2026-23893)

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-2026-23893

https://security-tracker.debian.org/tracker/CVE-2026-23893

https://ubuntu.com/security/CVE-2026-23893

Plugin Details

Severity: Medium

ID: 297680

File Name: unpatched_CVE_2026_23893.nasl

Version: 1.2

Type: local

Agent: unix

Family: Misc.

Published: 2/3/2026

Updated: 2/3/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.3

CVSS v2

Risk Factor: Medium

Base Score: 6

Temporal Score: 5.1

Vector: CVSS2#AV:L/AC:H/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-23893

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 6.2

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:redhat:enterprise_linux:6, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:redhat:enterprise_linux:opencryptoki-ccatok, p-cpe:/a:redhat:enterprise_linux:opencryptoki-devel, p-cpe:/a:redhat:enterprise_linux:opencryptoki-libs, p-cpe:/a:redhat:enterprise_linux:opencryptoki-swtok, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:centos:centos:opencryptoki-ccatok, p-cpe:/a:centos:centos:opencryptoki-devel, p-cpe:/a:centos:centos:opencryptoki-libs, p-cpe:/a:centos:centos:opencryptoki-swtok, cpe:/o:centos:centos:7, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:centos:centos:8, p-cpe:/a:canonical:ubuntu_linux:opencryptoki, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:redhat:enterprise_linux:9, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:redhat:enterprise_linux:opencryptoki, p-cpe:/a:redhat:enterprise_linux:opencryptoki-ep11tok, p-cpe:/a:redhat:enterprise_linux:opencryptoki-icatok, p-cpe:/a:redhat:enterprise_linux:opencryptoki-icsftok, p-cpe:/a:redhat:enterprise_linux:opencryptoki-tpmtok, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:opencryptoki, cpe:/o:debian:debian_linux:14.0, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:centos:centos:opencryptoki, p-cpe:/a:centos:centos:opencryptoki-ep11tok, p-cpe:/a:centos:centos:opencryptoki-icatok, p-cpe:/a:centos:centos:opencryptoki-icsftok, p-cpe:/a:centos:centos:opencryptoki-tpmtok

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: 1/22/2026

Reference Information

CVE: CVE-2026-23893