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Unity Linux 20.1070e Security Update: kernel (UTSA-2025-990817)

high Nessus Plugin ID 275086

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-2025-990817 advisory.

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

 Squashfs: sanity check symbolic link size

 Syzkiller reports a KMSAN: uninit-value in pick_link bug.

 This is caused by an uninitialised page, which is ultimately caused by a corrupted symbolic link size read from disk.

 The reason why the corrupted symlink size causes an uninitialised page is due to the following sequence of events:

 1. squashfs_read_inode() is called to read the symbolic link from disk. This assigns the corrupted value 3875536935 to inode->i_size.

 2. Later squashfs_symlink_read_folio() is called, which assigns this corrupted value to the length variable, which being a signed int, overflows producing a negative number.

 3. The following loop that fills in the page contents checks that the copied bytes is less than length, which being negative means the loop is skipped, producing an uninitialised page.

 This patch adds a sanity check which checks that the symbolic link size is not larger than expected.

 --

 V2: fix spelling mistake.

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?25e4c534

https://nvd.nist.gov/vuln/detail/CVE-2024-46744

Plugin Details

Severity: High

ID: 275086

File Name: unity_linux_UTSA-2025-990817.nasl

Version: 1.1

Type: local

Published: 11/12/2025

Updated: 11/12/2025

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-2024-46744

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: 11/12/2025

Vulnerability Publication Date: 4/9/2024

Reference Information

CVE: CVE-2024-46744