---
id: CVE-2023-54318
title: >-
  net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in
  smcr_port_add
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in
  smcr_port_add


  While doing smcr_port_add, there maybe linkgroup add into or delete

  from smc_lgr_l…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1f90a05d9ff907c70456e7c9d7058372679a88c6 <
    d1c6c93c27a4bf48006ab16cd9b38d85559d7645
  - >-
    Linux >= 1f90a05d9ff907c70456e7c9d7058372679a88c6 <
    06b4934ab2b534bb92935c7601852066ebb9eab8
  - >-
    Linux >= 1f90a05d9ff907c70456e7c9d7058372679a88c6 <
    70c8d17007dc4a07156b7da44509527990e569b3
  - >-
    Linux >= 1f90a05d9ff907c70456e7c9d7058372679a88c6 <
    b717463610a27fc0b58484cfead7a623d5913e61
  - >-
    Linux >= 1f90a05d9ff907c70456e7c9d7058372679a88c6 <
    f5146e3ef0a9eea405874b36178c19a4863b8989
  - Linux 5.8
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:40:19.800545Z'
published: '2025-12-30'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:41:44.789Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-54318'
references:
  - url: 'https://git.kernel.org/stable/c/d1c6c93c27a4bf48006ab16cd9b38d85559d7645'
  - url: 'https://git.kernel.org/stable/c/06b4934ab2b534bb92935c7601852066ebb9eab8'
  - url: 'https://git.kernel.org/stable/c/70c8d17007dc4a07156b7da44509527990e569b3'
  - url: 'https://git.kernel.org/stable/c/b717463610a27fc0b58484cfead7a623d5913e61'
  - url: 'https://git.kernel.org/stable/c/f5146e3ef0a9eea405874b36178c19a4863b8989'
tags:
  - cve.org
epss: 0.00276
epssPercentile: 0.18651
ingestedAt: '2026-10-15T22:48:25.439Z'
---

## Overview

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

net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add

While doing smcr_port_add, there maybe linkgroup add into or delete
from smc_lgr_list.list at the same time, which may result kernel crash.
So, use smc_lgr_list.lock to protect smc_lgr_list.list iterate in
smcr_port_add.

The crash calltrace show below:
BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 0 P4D 0
Oops: 0000 [#1] SMP NOPTI
CPU: 0 PID: 559726 Comm: kworker/0:92 Kdump: loaded Tainted: G
Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 449e491 04/01/2014
Workqueue: events smc_ib_port_event_work [smc]
RIP: 0010:smcr_port_add+0xa6/0xf0 [smc]
RSP: 0000:ffffa5a2c8f67de0 EFLAGS: 00010297
RAX: 0000000000000001 RBX: ffff9935e0650000 RCX: 0000000000000000
RDX: 0000000000000010 RSI: ffff9935e0654290 RDI: ffff9935c8560000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff9934c0401918
R10: 0000000000000000 R11: ffffffffb4a5c278 R12: ffff99364029aae4
R13: ffff99364029aa00 R14: 00000000ffffffed R15: ffff99364029ab08
FS:  0000000000000000(0000) GS:ffff994380600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000f06a10003 CR4: 0000000002770ef0
PKRU: 55555554
Call Trace:
 smc_ib_port_event_work+0x18f/0x380 [smc]
 process_one_work+0x19b/0x340
 worker_thread+0x30/0x370
 ? process_one_work+0x340/0x340
 kthread+0x114/0x130
 ? __kthread_cancel_work+0x50/0x50
 ret_from_fork+0x1f/0x30

## Affected

- `Linux >= 1f90a05d9ff907c70456e7c9d7058372679a88c6 < d1c6c93c27a4bf48006ab16cd9b38d85559d7645`
- `Linux >= 1f90a05d9ff907c70456e7c9d7058372679a88c6 < 06b4934ab2b534bb92935c7601852066ebb9eab8`
- `Linux >= 1f90a05d9ff907c70456e7c9d7058372679a88c6 < 70c8d17007dc4a07156b7da44509527990e569b3`
- `Linux >= 1f90a05d9ff907c70456e7c9d7058372679a88c6 < b717463610a27fc0b58484cfead7a623d5913e61`
- `Linux >= 1f90a05d9ff907c70456e7c9d7058372679a88c6 < f5146e3ef0a9eea405874b36178c19a4863b8989`
- `Linux 5.8`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.