Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986303)

medium Nessus Plugin ID 269165

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-2025-986303 advisory.

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

sysv: don't call sb_bread() with pointers_lock held

syzbot is reporting sleep in atomic context in SysV filesystem [1], for sb_bread() is called with rw_spinlock held.

A write_lock(&pointers_lock) => read_lock(&pointers_lock) deadlock bug and a sb_bread() with write_lock(&pointers_lock) bug were introduced by Replace BKL for chain locking with sysvfs-private rwlock in Linux 2.5.12.

Then, [PATCH] err1-40: sysvfs locking fix in Linux 2.6.8 fixed the former bug by moving pointers_lock lock to the callers, but instead introduced a sb_bread() with read_lock(&pointers_lock) bug (which made this problem easier to hit).

Al Viro suggested that why not to do like get_branch()/get_block()/ find_shared() in Minix filesystem does. And doing like that is almost a revert of [PATCH] err1-40: sysvfs locking fix except that get_branch() from with find_shared() is called without write_lock(&pointers_lock).

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.

Plugin Details

Severity: Medium

ID: 269165

File Name: unity_linux_UTSA-2025-986303.nasl

Version: 1.1

Type: local

Family: Unity Linux Local Security Checks

Published: 10/7/2025

Updated: 10/7/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

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-2023-52699

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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: 9/22/2025

Vulnerability Publication Date: 12/12/2023

Reference Information

CVE: CVE-2023-52699

Detections

Analytics