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Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986743)

medium Nessus Plugin ID 268571

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-2025-986743 advisory.

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

 KVM: Don't null dereference ops->destroy

 A KVM device cleanup happens in either of two callbacks:
 1) destroy() which is called when the VM is being destroyed;
 2) release() which is called when a device fd is closed.

 Most KVM devices use 1) but Book3s's interrupt controller KVM devices (XICS, XIVE, XIVE-native) use 2) as they need to close and reopen during the machine execution. The error handling in kvm_ioctl_create_device() assumes destroy() is always defined which leads to NULL dereference as discovered by Syzkaller.

 This adds a checks for destroy!=NULL and adds a missing release().

 This is not changing kvm_destroy_devices() as devices with defined release() should have been removed from the KVM devices list by then.

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?5bba731a

http://www.nessus.org/u?8f1d2985

https://nvd.nist.gov/vuln/detail/CVE-2022-49568

Plugin Details

Severity: Medium

ID: 268571

File Name: unity_linux_UTSA-2025-986743.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-2022-49568

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: 9/23/2025

Vulnerability Publication Date: 10/11/2022

Reference Information

CVE: CVE-2022-49568