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Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-391626)

medium Nessus Plugin ID 267307

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-2025-391626 advisory.

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

 USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()

 This patch addresses a null-ptr-deref in qt2_process_read_urb() due to an incorrect bounds check in the following:

 if (newport > serial->num_ports) { dev_err(&port->dev, %s - port change to invalid port: %i\n,
 __func__, newport);
 break;
 }

 The condition doesn't account for the valid range of the serial->port buffer, which is from 0 to serial->num_ports - 1. When newport is equal to serial->num_ports, the assignment of port in the following code is out-of-bounds and NULL:

 serial_priv->current_port = newport;
 port = serial->port[serial_priv->current_port];

 The fix checks if newport is greater than or equal to serial->num_ports indicating it is out-of-bounds.

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?3c92f7d7

http://www.nessus.org/u?555068d2

https://nvd.nist.gov/vuln/detail/CVE-2025-21689

Plugin Details

Severity: Medium

ID: 267307

File Name: unity_linux_UTSA-2025-391626.nasl

Version: 1.2

Type: local

Published: 10/7/2025

Updated: 10/15/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

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-2025-21689

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: 7/8/2025

Vulnerability Publication Date: 2/10/2025

Reference Information

CVE: CVE-2025-21689