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Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-993177)

medium Nessus Plugin ID 281278

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-2025-993177 advisory.

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

 wifi: nl80211: reject cooked mode if it is set along with other flags

 It is possible to set both MONITOR_FLAG_COOK_FRAMES and MONITOR_FLAG_ACTIVE flags simultaneously on the same monitor interface from the userspace. This causes a sub-interface to be created with no IEEE80211_SDATA_IN_DRIVER bit set because the monitor interface is in the cooked state and it takes precedence over all other states. When the interface is then being deleted the kernel calls WARN_ONCE() from check_sdata_in_driver() because of missing that bit.

 Fix this by rejecting MONITOR_FLAG_COOK_FRAMES if it is set along with other flags.

 Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

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?daa34512

http://www.nessus.org/u?371e1885

https://nvd.nist.gov/vuln/detail/CVE-2025-21909

Plugin Details

Severity: Medium

ID: 281278

File Name: unity_linux_UTSA-2025-993177.nasl

Version: 1.1

Type: local

Published: 12/31/2025

Updated: 12/31/2025

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-2025-21909

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

Exploit Ease: No known exploits are available

Patch Publication Date: 12/31/2025

Vulnerability Publication Date: 4/1/2025

Reference Information

CVE: CVE-2025-21909