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Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986694)

medium Nessus Plugin ID 268550

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-2025-986694 advisory.

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

 nvdimm: Fix firmware activation deadlock scenarios

 Lockdep reports the following deadlock scenarios for CXL root device power-management, device_prepare(), operations, and device_shutdown() operations for 'nd_region' devices:

 Chain exists of:
 &nvdimm_region_key --> &nvdimm_bus->reconfig_mutex --> system_transition_mutex

 Possible unsafe locking scenario:

 CPU0 CPU1
 ---- ---- lock(system_transition_mutex);
 lock(&nvdimm_bus->reconfig_mutex);
 lock(system_transition_mutex);
 lock(&nvdimm_region_key);

 Chain exists of:
 &cxl_nvdimm_bridge_key --> acpi_scan_lock --> &cxl_root_key

 Possible unsafe locking scenario:

 CPU0 CPU1
 ---- ---- lock(&cxl_root_key);
 lock(acpi_scan_lock);
 lock(&cxl_root_key);
 lock(&cxl_nvdimm_bridge_key);

 These stem from holding nvdimm_bus_lock() over hibernate_quiet_exec() which walks the entire system device topology taking device_lock() along the way. The nvdimm_bus_lock() is protecting against unregistration, multiple simultaneous ops callers, and preventing activate_show() from racing activate_store(). For the first 2, the lock is redundant.
 Unregistration already flushes all ops users, and sysfs already prevents multiple threads to be active in an ops handler at the same time. For the last userspace should already be waiting for its last activate_store() to complete, and does not need activate_show() to flush the write side, so this lock usage can be deleted in these attributes.

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?10bccc3f

http://www.nessus.org/u?a0527416

https://nvd.nist.gov/vuln/detail/CVE-2022-49446

Plugin Details

Severity: Medium

ID: 268550

File Name: unity_linux_UTSA-2025-986694.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-2022-49446

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: 7/15/2022

Reference Information

CVE: CVE-2022-49446