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Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-001239)

medium Nessus Plugin ID 290865

Synopsis

The Unity Linux host is missing one or more security updates.

Description

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-001239 advisory.

 An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected kernel package.

See Also

http://www.nessus.org/u?3095bcab

http://www.nessus.org/u?5a1eb00a

https://bugzilla.kernel.org/show_bug.cgi?id=200131

http://www.nessus.org/u?d70bf897

https://security-tracker.debian.org/tracker/CVE-2018-12633

Plugin Details

Severity: Medium

ID: 290865

File Name: unity_linux_UTSA-2026-001239.nasl

Version: 1.1

Type: local

Published: 1/16/2026

Updated: 1/16/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Medium

Base Score: 6.3

Temporal Score: 4.7

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

CVSS Score Source: CVE-2018-12633

CVSS v3

Risk Factor: Medium

Base Score: 6.3

Temporal Score: 5.5

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

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

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/UOS-Server/release, Host/UOS-Server/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 1/14/2026

Vulnerability Publication Date: 6/22/2018

Reference Information

CVE: CVE-2018-12633