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Unity Linux 20.1070e Security Update: kernel (UTSA-2025-989612)

medium Nessus Plugin ID 272857

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-2025-989612 advisory.

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

 afs: Fix dynamic root getattr

 The recent patch to make afs_getattr consult the server didn't account for the pseudo-inodes employed by the dynamic root-type afs superblock not having a volume or a server to access, and thus an oops occurs if such a directory is stat'd.

 Fix this by checking to see if the vnode->volume pointer actually points anywhere before following it in afs_getattr().

 This can be tested by stat'ing a directory in /afs. It may be sufficient just to do ls /afs and the oops looks something like:

 BUG: kernel NULL pointer dereference, address: 0000000000000020 ...
 RIP: 0010:afs_getattr+0x8b/0x14b ...
 Call Trace:
 <TASK> vfs_statx+0x79/0xf5 vfs_fstatat+0x49/0x62

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?89149e57

http://www.nessus.org/u?d6169e0e

https://nvd.nist.gov/vuln/detail/CVE-2022-49688

Plugin Details

Severity: Medium

ID: 272857

File Name: unity_linux_UTSA-2025-989612.nasl

Version: 1.1

Type: local

Published: 11/5/2025

Updated: 11/5/2025

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-2022-49688

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: 11/5/2025

Vulnerability Publication Date: 7/21/2022

Reference Information

CVE: CVE-2022-49688