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Unity Linux 20.1070e Security Update: kernel (UTSA-2026-010877)
medium Nessus Plugin ID 308982
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-2026-010877 advisory.In the Linux kernel, the following vulnerability has been resolved:
Squashfs: fix uninit-value in squashfs_get_parent
Syzkaller reports a KMSAN: uninit-value in squashfs_get_parent bug.
This is caused by open_by_handle_at() being called with a file handle containing an invalid parent inode number. In particular the inode number is that of a symbolic link, rather than a directory.
Squashfs_get_parent() gets called with that symbolic link inode, and accesses the parent member field.
unsigned int parent_ino = squashfs_i(inode)->parent;
Because non-directory inodes in Squashfs do not have a parent value, this is uninitialised, and this causes an uninitialised value access.
The fix is to initialise parent with the invalid inode 0, which will cause an EINVAL error to be returned.
Regular inodes used to share the parent field with the block_list_start field. This is removed in this commit to enable the parent field to contain the invalid inode number 0.
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?37447e89
Plugin Details
Severity: Medium
ID: 308982
File Name: unity_linux_UTSA-2026-010877.nasl
Version: 1.1
Type: Local
Published: 4/21/2026
Updated: 4/21/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.2
CVSS v2
Risk Factor: Medium
Base Score: 5.2
Temporal Score: 3.8
Vector: CVSS2#AV:L/AC:L/Au:S/C:P/I:N/A:C
CVSS Score Source: CVE-2025-40049
CVSS v3
Risk Factor: Medium
Base Score: 6.1
Temporal Score: 5.3
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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: 4/20/2026
Vulnerability Publication Date: 10/28/2025
Reference Information
CVE: CVE-2025-40049