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Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013002)

high Nessus Plugin ID 307848

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-2026-013002 advisory.

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

 bfs: Reconstruct file type when loading from disk

 syzbot is reporting that S_IFMT bits of inode->i_mode can become bogus when the S_IFMT bits of the 32bits mode field loaded from disk are corrupted or when the 32bits attributes field loaded from disk are corrupted.

 A documentation says that BFS uses only lower 9 bits of the mode field.
 But I can't find an explicit explanation that the unused upper 23 bits (especially, the S_IFMT bits) are initialized with 0.

 Therefore, ignore the S_IFMT bits of the mode field loaded from disk.
 Also, verify that the value of the attributes field loaded from disk is either BFS_VREG or BFS_VDIR (because BFS supports only regular files and the root directory).

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?a6a76991

http://www.nessus.org/u?a8d36d2e

https://nvd.nist.gov/vuln/detail/CVE-2025-68266

Plugin Details

Severity: High

ID: 307848

File Name: unity_linux_UTSA-2026-013002.nasl

Version: 1.1

Type: Local

Published: 4/21/2026

Updated: 4/21/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 6.9

Temporal Score: 5.1

Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2025-68266

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/21/2026

Vulnerability Publication Date: 12/16/2025

Reference Information

CVE: CVE-2025-68266