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Unity Linux 20.1070a Security Update: kernel (UTSA-2025-986447)

medium Nessus Plugin ID 269004

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-2025-986447 advisory.

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

 udf: Fix NULL pointer dereference in udf_symlink function

 In function udf_symlink, epos.bh is assigned with the value returned by udf_tgetblk. The function udf_tgetblk is defined in udf/misc.c and returns the value of sb_getblk function that could be NULL.
 Then, epos.bh is used without any check, causing a possible NULL pointer dereference when sb_getblk fails.

 This fix adds a check to validate the value of epos.bh.

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.

See Also

http://www.nessus.org/u?a078981f

https://nvd.nist.gov/vuln/detail/CVE-2021-47353

Plugin Details

Severity: Medium

ID: 269004

File Name: unity_linux_UTSA-2025-986447.nasl

Version: 1.1

Type: local

Published: 10/7/2025

Updated: 10/7/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

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-2021-47353

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: 9/22/2025

Vulnerability Publication Date: 1/28/2022

Reference Information

CVE: CVE-2021-47353