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Unity Linux 20.1070a Security Update: kernel (UTSA-2025-986539)

medium Nessus Plugin ID 267971

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-2025-986539 advisory.

 In the Linux kernel, the following vulnerability has been resolved:

 net: hso: fix NULL-deref on disconnect regression

 Commit 8a12f8836145 (net: hso: fix null-ptr-deref during tty device unregistration) fixed the racy minor allocation reported by syzbot, but introduced an unconditional NULL-pointer dereference on every disconnect instead.

 Specifically, the serial device table must no longer be accessed after the minor has been released by hso_serial_tty_unregister().

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.

See Also

http://www.nessus.org/u?58821604

https://nvd.nist.gov/vuln/detail/CVE-2021-46905

Plugin Details

Severity: Medium

ID: 267971

File Name: unity_linux_UTSA-2025-986539.nasl

Version: 1.1

Type: local

Published: 10/7/2025

Updated: 10/7/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2021-46905

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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/cpu, Host/UOS-Server/release, Host/UOS-Server/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 9/22/2025

Vulnerability Publication Date: 11/9/2021

Reference Information

CVE: CVE-2021-46905