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Unity Linux 20.1070a Security Update: kernel (UTSA-2025-990196)

high Nessus Plugin ID 272362

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-2025-990196 advisory.

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

 greybus: Fix use-after-free bug in gb_interface_release due to race condition.

 In gb_interface_create, &intf->mode_switch_completion is bound with gb_interface_mode_switch_work. Then it will be started by gb_interface_request_mode_switch. Here is the relevant code.
 if (!queue_work(system_long_wq, &intf->mode_switch_work)) { ...
 }

 If we call gb_interface_release to make cleanup, there may be an unfinished work. This function will call kfree to free the object intf. However, if gb_interface_mode_switch_work is scheduled to run after kfree, it may cause use-after-free error as gb_interface_mode_switch_work will use the object intf.
 The possible execution flow that may lead to the issue is as follows:

 CPU0 CPU1

 | gb_interface_create | gb_interface_request_mode_switch gb_interface_release | kfree(intf) (free) | | gb_interface_mode_switch_work | mutex_lock(&intf->mutex) (use)

 Fix it by canceling the work before kfree.

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?6d5fd066

https://nvd.nist.gov/vuln/detail/CVE-2024-39495

Plugin Details

Severity: High

ID: 272362

File Name: unity_linux_UTSA-2025-990196.nasl

Version: 1.1

Type: local

Published: 11/5/2025

Updated: 11/5/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2024-39495

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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: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: 11/5/2025

Vulnerability Publication Date: 7/12/2024

Reference Information

CVE: CVE-2024-39495