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Unity Linux 20.1070e Security Update: kernel (UTSA-2025-386530)

medium Nessus Plugin ID 267265

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-2025-386530 advisory.

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

 media: bttv: fix use after free error due to btv->timeout timer

 There may be some a race condition between timer function bttv_irq_timeout and bttv_remove. The timer is setup in probe and there is no timer_delete operation in remove function. When it hit kfree btv, the function might still be invoked, which will cause use after free bug.

 This bug is found by static analysis, it may be false positive.

 Fix it by adding del_timer_sync invoking to the remove function.

 cpu0 cpu1 bttv_probe
 ->timer_setup
 ->bttv_set_dma
 ->mod_timer;
 bttv_remove
 ->kfree(btv);
 ->bttv_irq_timeout
 ->USE btv

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.

See Also

http://www.nessus.org/u?80303aa0

http://www.nessus.org/u?10857f15

https://nvd.nist.gov/vuln/detail/CVE-2023-52847

Plugin Details

Severity: Medium

ID: 267265

File Name: unity_linux_UTSA-2025-386530.nasl

Version: 1.1

Type: local

Published: 10/7/2025

Updated: 10/7/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.7

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:L/AC:H/Au:S/C:P/I:P/A:C

CVSS Score Source: CVE-2023-52847

CVSS v3

Risk Factor: Medium

Base Score: 5.2

Temporal Score: 4.5

Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/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: 7/21/2021

Reference Information

CVE: CVE-2023-52847