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Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-420717)

medium Nessus Plugin ID 266864

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-2025-420717 advisory.

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

 quota: flush quota_release_work upon quota writeback

 One of the paths quota writeback is called from is:

 freeze_super() sync_filesystem() ext4_sync_fs() dquot_writeback_dquots()

 Since we currently don't always flush the quota_release_work queue in this path, we can end up with the following race:

 1. dquot are added to releasing_dquots list during regular operations.
 2. FS Freeze starts, however, this does not flush the quota_release_work queue.
 3. Freeze completes.
 4. Kernel eventually tries to flush the workqueue while FS is frozen which hits a WARN_ON since transaction gets started during frozen state:

 ext4_journal_check_start+0x28/0x110 [ext4] (unreliable)
 __ext4_journal_start_sb+0x64/0x1c0 [ext4] ext4_release_dquot+0x90/0x1d0 [ext4] quota_release_workfn+0x43c/0x4d0

 Which is the following line:

 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);

 Which ultimately results in generic/390 failing due to dmesg noise. This was detected on powerpc machine 15 cores.

 To avoid this, make sure to flush the workqueue during dquot_writeback_dquots() so we dont have any pending workitems after freeze.

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?32fc1ede

https://nvd.nist.gov/vuln/detail/CVE-2024-56780

Plugin Details

Severity: Medium

ID: 266864

File Name: unity_linux_UTSA-2025-420717.nasl

Version: 1.1

Type: local

Published: 10/7/2025

Updated: 10/7/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

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-2024-56780

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: 12/12/2023

Reference Information

CVE: CVE-2024-56780