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Unity Linux 20.1070e Security Update: kernel (UTSA-2025-990157)

high Nessus Plugin ID 272685

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-2025-990157 advisory.

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

 net/smc: avoid data corruption caused by decline

 We found a data corruption issue during testing of SMC-R on Redis applications.

 The benchmark has a low probability of reporting a strange error as shown below.

 Error: Protocol error, got \xe2 as reply type byte

 Finally, we found that the retrieved error data was as follows:

 0xE2 0xD4 0xC3 0xD9 0x04 0x00 0x2C 0x20 0xA6 0x56 0x00 0x16 0x3E 0x0C 0xCB 0x04 0x02 0x01 0x00 0x00 0x20 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0xE2

 It is quite obvious that this is a SMC DECLINE message, which means that the applications received SMC protocol message.
 We found that this was caused by the following situations:

 client server clc proposal
 -------------> clc accept <------------- clc confirm
 -------------> wait llc confirm send llc confirm failed llc confirm x------ (after 2s)timeout wait llc confirm rsp

 wait decline

 (after 1s) timeout (after 2s) timeout decline
 --------------> decline <--------------

 As a result, a decline message was sent in the implementation, and this message was read from TCP by the already-fallback connection.

 This patch double the client timeout as 2x of the server value, With this simple change, the Decline messages should never cross or collide (during Confirm link timeout).

 This issue requires an immediate solution, since the protocol updates involve a more long-term solution.

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?1c24d16b

http://www.nessus.org/u?0d587a5a

https://nvd.nist.gov/vuln/detail/CVE-2023-52775

Plugin Details

Severity: High

ID: 272685

File Name: unity_linux_UTSA-2025-990157.nasl

Version: 1.1

Type: local

Published: 11/5/2025

Updated: 11/5/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2023-52775

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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: 1/9/2024

Reference Information

CVE: CVE-2023-52775