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Unity Linux 20.1070e Security Update: kernel (UTSA-2026-011346)
medium Nessus Plugin ID 308772
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-2026-011346 advisory.In the Linux kernel, the following vulnerability has been resolved:
block: don't allow the same type rq_qos add more than once
In our test of iocost, we encountered some list add/del corruptions of inner_walk list in ioc_timer_fn.
The reason can be described as follows:
cpu 0 cpu 1 ioc_qos_write ioc_qos_write
ioc = q_to_ioc(queue);
if (!ioc) { ioc = kzalloc();
ioc = q_to_ioc(queue);
if (!ioc) { ioc = kzalloc();
...
rq_qos_add(q, rqos);
} ...
rq_qos_add(q, rqos);
...
}
When the io.cost.qos file is written by two cpus concurrently, rq_qos may be added to one disk twice. In that case, there will be two iocs enabled and running on one disk. They own different iocgs on their active list. In the ioc_timer_fn function, because of the iocgs from two iocs have the same root iocg, the root iocg's walk_list may be overwritten by each other and this leads to list add/del corruptions in building or destroying the inner_walk list.
And so far, the blk-rq-qos framework works in case that one instance for one type rq_qos per queue by default. This patch make this explicit and also fix the crash above.
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?81c8f17f
Plugin Details
Severity: Medium
ID: 308772
File Name: unity_linux_UTSA-2026-011346.nasl
Version: 1.1
Type: Local
Published: 4/21/2026
Updated: 4/21/2026
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-2022-50086
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/UOS-Server/release, Host/UOS-Server/rpm-list, Host/cpu
Exploit Ease: No known exploits are available
Patch Publication Date: 4/20/2026
Vulnerability Publication Date: 10/11/2022
Reference Information
CVE: CVE-2022-50086