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Unity Linux 20.1070a Security Update: kernel (UTSA-2026-005756)

medium Nessus Plugin ID 300346

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-2026-005756 advisory.

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

 net: tipc: fix refcount warning in tipc_aead_encrypt

 syzbot reported a refcount warning [1] caused by calling get_net() on a network namespace that is being destroyed (refcount=0). This happens when a TIPC discovery timer fires during network namespace cleanup.

 The recently added get_net() call in commit e279024617134 (net/tipc:
 fix slab-use-after-free Read in tipc_aead_encrypt_done) attempts to hold a reference to the network namespace. However, if the namespace is already being destroyed, its refcount might be zero, leading to the use-after-free warning.

 Replace get_net() with maybe_get_net(), which safely checks if the refcount is non-zero before incrementing it. If the namespace is being destroyed, return -ENODEV early, after releasing the bearer reference.

 [1]: https://lore.kernel.org/all/[email protected]/T/#m12019cf9ae77e1954f666914 640efa36d52704a2

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?dfaf54d4

http://www.nessus.org/u?e3a3ae0b

https://nvd.nist.gov/vuln/detail/CVE-2025-38273

Plugin Details

Severity: Medium

ID: 300346

File Name: unity_linux_UTSA-2026-005756.nasl

Version: 1.1

Type: local

Published: 3/3/2026

Updated: 3/3/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

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-2025-38273

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/3/2026

Vulnerability Publication Date: 7/10/2025

Reference Information

CVE: CVE-2025-38273