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Unity Linux 20.1050e Security Update: kernel (UTSA-2026-021524)

medium Nessus Plugin ID 315844

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-2026-021524 advisory.

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

 driver core: fix potential null-ptr-deref in device_add()

 I got the following null-ptr-deref report while doing fault injection test:

 BUG: kernel NULL pointer dereference, address: 0000000000000058 CPU: 2 PID: 278 Comm: 37-i2c-ds2482 Tainted: G B W N 6.1.0-rc3+ RIP: 0010:klist_put+0x2d/0xd0 Call Trace:
 <TASK> klist_remove+0xf1/0x1c0 device_release_driver_internal+0x196/0x210 bus_remove_device+0x1bd/0x240 device_add+0xd3d/0x1100 w1_add_master_device+0x476/0x490 [wire] ds2482_probe+0x303/0x3e0 [ds2482]

 This is how it happened:

 w1_alloc_dev() // The dev->driver is set to w1_master_driver.
 memcpy(&dev->dev, device, sizeof(struct device));
 device_add() bus_add_device() dpm_sysfs_add() // It fails, calls bus_remove_device.

 // error path bus_remove_device() // The dev->driver is not null, but driver is not bound.
 __device_release_driver() klist_remove(&dev->p->knode_driver) <-- It causes null-ptr-deref.

 // normal path bus_probe_device() // It's not called yet.
 device_bind_driver()

 If dev->driver is set, in the error path after calling bus_add_device() in device_add(), bus_remove_device() is called, then the device will be detached from driver. But device_bind_driver() is not called yet, so it causes null-ptr-deref while access the 'knode_driver'. To fix this, set dev->driver to null in the error path before calling bus_remove_device().

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?baaf592e

http://www.nessus.org/u?3bd431c4

https://nvd.nist.gov/vuln/detail/CVE-2023-54321

Plugin Details

Severity: Medium

ID: 315844

File Name: unity_linux_UTSA-2026-021524.nasl

Version: 1.1

Type: Local

Published: 5/20/2026

Updated: 5/20/2026

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-2023-54321

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/UOS-Server/release, Host/UOS-Server/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 5/21/2026

Vulnerability Publication Date: 12/30/2025

Reference Information

CVE: CVE-2023-54321