Detections
Analytics

Linux Distros Unpatched Vulnerability : CVE-2026-76925

medium Nessus Plugin ID 342817

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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.

 - A flaw was found in Flatpak. A Time-of-check to time-of-use (TOCTOU) race condition exists in the `org.freedesktop.Flatpak.SystemHelper` component. This vulnerability occurs because a privileged `chmod` operation executes before the OSTree repository validation within the `Deploy()` function. An attacker can exploit this timing window to redirect symlinks to arbitrary files, potentially leading to unauthorized file manipulation or information disclosure. (CVE-2026-76925)

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-2026-76925

https://ubuntu.com/security/CVE-2026-76925

Plugin Details

Severity: Medium

ID: 342817

File Name: unpatched_CVE_2026_76925.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 9/4/2026

Updated: 9/8/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3.9

Percentile: 52.42

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.3

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

CVSS Score Source: CVE-2026-76925

CVSS v3

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 5.3

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

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

Vulnerability Information

CPE: 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:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:flatpak, p-cpe:/a:centos:centos:flatpak-builder, p-cpe:/a:centos:centos:flatpak-devel, p-cpe:/a:centos:centos:flatpak-libs, p-cpe:/a:centos:centos:flatpak-selinux, p-cpe:/a:centos:centos:flatpak-session-helper, p-cpe:/a:centos:centos:flatpak, p-cpe:/a:redhat:enterprise_linux:flatpak-builder, p-cpe:/a:redhat:enterprise_linux:flatpak-devel, p-cpe:/a:redhat:enterprise_linux:flatpak-libs, p-cpe:/a:redhat:enterprise_linux:flatpak-selinux, p-cpe:/a:redhat:enterprise_linux:flatpak-session-helper, p-cpe:/a:redhat:enterprise_linux:flatpak

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

Exploit Ease: No known exploits are available

Reference Information

CVE: CVE-2026-76925