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Unity Linux 20.1050e Security Update: kernel (UTSA-2025-990103)

high Nessus Plugin ID 272414

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-2025-990103 advisory.

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

 nilfs2: fix inode number range checks

 Patch series nilfs2: fix potential issues related to reserved inodes.

 This series fixes one use-after-free issue reported by syzbot, caused by nilfs2's internal inode being exposed in the namespace on a corrupted filesystem, and a couple of flaws that cause problems if the starting number of non-reserved inodes written in the on-disk super block is intentionally (or corruptly) changed from its default value.


 This patch (of 3):

 In the current implementation of nilfs2, nilfs->ns_first_ino, which gives the first non-reserved inode number, is read from the superblock, but its lower limit is not checked.

 As a result, if a number that overlaps with the inode number range of reserved inodes such as the root directory or metadata files is set in the super block parameter, the inode number test macros (NILFS_MDT_INODE and NILFS_VALID_INODE) will not function properly.

 In addition, these test macros use left bit-shift calculations using with the inode number as the shift count via the BIT macro, but the result of a shift calculation that exceeds the bit width of an integer is undefined in the C specification, so if ns_first_ino is set to a large value other than the default value NILFS_USER_INO (=11), the macros may potentially malfunction depending on the environment.

 Fix these issues by checking the lower bound of nilfs->ns_first_ino and by preventing bit shifts equal to or greater than the NILFS_USER_INO constant in the inode number test macros.

 Also, change the type of ns_first_ino from signed integer to unsigned integer to avoid the need for type casting in comparisons such as the lower bound check introduced this time.

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?dbe72aa2

http://www.nessus.org/u?16773804

https://nvd.nist.gov/vuln/detail/CVE-2024-42105

Plugin Details

Severity: High

ID: 272414

File Name: unity_linux_UTSA-2025-990103.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-2024-42105

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: 7/30/2024

Reference Information

CVE: CVE-2024-42105