Linux Distros Unpatched Vulnerability : CVE-2026-76642

high Nessus Plugin ID 342409

Language:

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.

- util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post- mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems.
Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation. (CVE-2026-76642)

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

Solution

There is no known solution at this time.

Plugin Details

Severity: High

ID: 342409

File Name: unpatched_CVE_2026_76642.nasl

Version: 1.6

Type: Local

Agent: unix

Family: Misc.

Published: 9/2/2026

Updated: 9/18/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.27

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-76642

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.1

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

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

CVSS v4

Risk Factor: High

Base Score: 8.5

Threat Score: 5.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:canonical:ubuntu_linux:util-linux, p-cpe:/a:debian:debian_linux:util-linux, p-cpe:/a:redhat:enterprise_linux:libblkid-devel, p-cpe:/a:redhat:enterprise_linux:libblkid, p-cpe:/a:redhat:enterprise_linux:libfdisk-devel, p-cpe:/a:redhat:enterprise_linux:libfdisk, p-cpe:/a:redhat:enterprise_linux:libmount-devel, p-cpe:/a:redhat:enterprise_linux:libmount, p-cpe:/a:redhat:enterprise_linux:libsmartcols-devel, p-cpe:/a:redhat:enterprise_linux:libsmartcols, p-cpe:/a:redhat:enterprise_linux:libuuid-devel, p-cpe:/a:redhat:enterprise_linux:libuuid, p-cpe:/a:redhat:enterprise_linux:python3-libmount, p-cpe:/a:redhat:enterprise_linux:util-linux-core, p-cpe:/a:redhat:enterprise_linux:util-linux, p-cpe:/a:redhat:enterprise_linux:uuidd

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

Exploit Ease: No known exploits are available

Reference Information

CVE: CVE-2026-76642

Detections

Analytics