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Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-390227)

medium Nessus Plugin ID 267082

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-2025-390227 advisory.

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

 wifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach

 This is the candidate patch of CVE-2023-47233 :
 https://nvd.nist.gov/vuln/detail/CVE-2023-47233

 In brcm80211 driver,it starts with the following invoking chain to start init a timeout worker:

 ->brcmf_usb_probe
 ->brcmf_usb_probe_cb
 ->brcmf_attach
 ->brcmf_bus_started
 ->brcmf_cfg80211_attach
 ->wl_init_priv
 ->brcmf_init_escan
 ->INIT_WORK(&cfg->escan_timeout_work, brcmf_cfg80211_escan_timeout_worker);

 If we disconnect the USB by hotplug, it will call brcmf_usb_disconnect to make cleanup. The invoking chain is :

 brcmf_usb_disconnect
 ->brcmf_usb_disconnect_cb
 ->brcmf_detach
 ->brcmf_cfg80211_detach
 ->kfree(cfg);

 While the timeout woker may still be running. This will cause a use-after-free bug on cfg in brcmf_cfg80211_escan_timeout_worker.

 Fix it by deleting the timer and canceling the worker in brcmf_cfg80211_detach.

 [[email protected]: keep timer delete as is and cancel work just before free]

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?48d59ce5

https://nvd.nist.gov/vuln/detail/CVE-2024-35811

Plugin Details

Severity: Medium

ID: 267082

File Name: unity_linux_UTSA-2025-390227.nasl

Version: 1.2

Type: local

Published: 10/7/2025

Updated: 10/15/2025

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-2024-35811

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: 7/8/2025

Vulnerability Publication Date: 4/9/2024

Reference Information

CVE: CVE-2024-35811