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Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098738)

high Nessus Plugin ID 340505

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-2026-098738 advisory.

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

 locking/spinlock/debug: Fix data-race in do_raw_write_lock

 KCSAN reports:

 BUG: KCSAN: data-race in do_raw_write_lock / do_raw_write_lock

 write (marked) to 0xffff800009cf504c of 4 bytes by task 1102 on cpu 1:
 do_raw_write_lock+0x120/0x204
 _raw_write_lock_irq do_exit call_usermodehelper_exec_async ret_from_fork

 read to 0xffff800009cf504c of 4 bytes by task 1103 on cpu 0:
 do_raw_write_lock+0x88/0x204
 _raw_write_lock_irq do_exit call_usermodehelper_exec_async ret_from_fork

 value changed: 0xffffffff -> 0x00000001

 Reported by Kernel Concurrency Sanitizer on:
 CPU: 0 PID: 1103 Comm: kworker/u4:1 6.1.111

 Commit 1a365e822372 (locking/spinlock/debug: Fix various data races) has adressed most of these races, but seems to be not consistent/not complete.

 >From do_raw_write_lock() only debug_write_lock_after() part has been converted to WRITE_ONCE(), but not debug_write_lock_before() part.
 Do it now.

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

https://nvd.nist.gov/vuln/detail/CVE-2025-68336

http://www.nessus.org/u?724bf61b

http://www.nessus.org/u?8f99007c

Plugin Details

Severity: High

ID: 340505

File Name: unity_linux_UTSA-2026-098738.nasl

Version: 1.1

Type: Local

Published: 8/26/2026

Updated: 8/26/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.71

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-68336

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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: 8/10/2026

Vulnerability Publication Date: 12/22/2025

Reference Information

CVE: CVE-2025-68336