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Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2025-992554)

medium Nessus Plugin ID 280408

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-2025-992554 advisory.

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

 net/smc: fix deadlock triggered by cancel_delayed_work_syn()

 The following LOCKDEP was detected:
 Workqueue: events smc_lgr_free_work [smc] WARNING: possible circular locking dependency detected 6.1.0-20221027.rc2.git8.56bc5b569087.300.fc36.s390x+debug #1 Not tainted
 ------------------------------------------------------ kworker/3:0/176251 is trying to acquire lock:
 00000000f1467148 ((wq_completion)smc_tx_wq-00000000#2){+.+.}-{0:0}, at: __flush_workqueue+0x7a/0x4f0 but task is already holding lock:
 0000037fffe97dc8 ((work_completion)(&(&lgr->free_work)->work)){+.+.}-{0:0}, at: process_one_work+0x232/0x730 which lock already depends on the new lock.
 the existing dependency chain (in reverse order) is:
 -> #4 ((work_completion)(&(&lgr->free_work)->work)){+.+.}-{0:0}:
 __lock_acquire+0x58e/0xbd8 lock_acquire.part.0+0xe2/0x248 lock_acquire+0xac/0x1c8
 __flush_work+0x76/0xf0
 __cancel_work_timer+0x170/0x220
 __smc_lgr_terminate.part.0+0x34/0x1c0 [smc] smc_connect_rdma+0x15e/0x418 [smc]
 __smc_connect+0x234/0x480 [smc] smc_connect+0x1d6/0x230 [smc]
 __sys_connect+0x90/0xc0
 __do_sys_socketcall+0x186/0x370
 __do_syscall+0x1da/0x208 system_call+0x82/0xb0
 -> #3 (smc_client_lgr_pending){+.+.}-{3:3}:
 __lock_acquire+0x58e/0xbd8 lock_acquire.part.0+0xe2/0x248 lock_acquire+0xac/0x1c8
 __mutex_lock+0x96/0x8e8 mutex_lock_nested+0x32/0x40 smc_connect_rdma+0xa4/0x418 [smc]
 __smc_connect+0x234/0x480 [smc] smc_connect+0x1d6/0x230 [smc]
 __sys_connect+0x90/0xc0
 __do_sys_socketcall+0x186/0x370
 __do_syscall+0x1da/0x208 system_call+0x82/0xb0
 -> #2 (sk_lock-AF_SMC){+.+.}-{0:0}:
 __lock_acquire+0x58e/0xbd8 lock_acquire.part.0+0xe2/0x248 lock_acquire+0xac/0x1c8 lock_sock_nested+0x46/0xa8 smc_tx_work+0x34/0x50 [smc] process_one_work+0x30c/0x730 worker_thread+0x62/0x420 kthread+0x138/0x150
 __ret_from_fork+0x3c/0x58 ret_from_fork+0xa/0x40
 -> #1 ((work_completion)(&(&smc->conn.tx_work)->work)){+.+.}-{0:0}:
 __lock_acquire+0x58e/0xbd8 lock_acquire.part.0+0xe2/0x248 lock_acquire+0xac/0x1c8 process_one_work+0x2bc/0x730 worker_thread+0x62/0x420 kthread+0x138/0x150
 __ret_from_fork+0x3c/0x58 ret_from_fork+0xa/0x40
 -> #0 ((wq_completion)smc_tx_wq-00000000#2){+.+.}-{0:0}:
 check_prev_add+0xd8/0xe88 validate_chain+0x70c/0xb20
 __lock_acquire+0x58e/0xbd8 lock_acquire.part.0+0xe2/0x248 lock_acquire+0xac/0x1c8
 __flush_workqueue+0xaa/0x4f0 drain_workqueue+0xaa/0x158 destroy_workqueue+0x44/0x2d8 smc_lgr_free+0x9e/0xf8 [smc] process_one_work+0x30c/0x730 worker_thread+0x62/0x420 kthread+0x138/0x150
 __ret_from_fork+0x3c/0x58 ret_from_fork+0xa/0x40 other info that might help us debug this:
 Chain exists of:
 (wq_completion)smc_tx_wq-00000000#2
 --> smc_client_lgr_pending
 --> (work_completion)(&(&lgr->free_work)->work) Possible unsafe locking scenario:
 CPU0 CPU1
 ---- ---- lock((work_completion)(&(&lgr->free_work)->work));
 lock(smc_client_lgr_pending);
 lock((work_completion) (&(&lgr->free_work)->work));
 lock((wq_completion)smc_tx_wq-00000000#2);
 *** DEADLOCK *** 2 locks held by kworker/3:0/176251:
 #0: 0000000080183548 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x232/0x730 #1: 0000037fffe97dc8 ((work_completion) (&(&lgr->free_work)->work)){+.+.}-{0:0}, at: process_one_work+0x232/0x730 stack backtr
 ---truncated---

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?27b4817e

http://www.nessus.org/u?135c4fed

https://nvd.nist.gov/vuln/detail/CVE-2023-53233

Plugin Details

Severity: Medium

ID: 280408

File Name: unity_linux_UTSA-2025-992554.nasl

Version: 1.1

Type: local

Published: 12/30/2025

Updated: 12/30/2025

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-2023-53233

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: 12/30/2025

Vulnerability Publication Date: 9/4/2021

Reference Information

CVE: CVE-2023-53233