---
id: CVE-2024-56641
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/smc: initialize close_work early to avoid warning

  We encountered a warning that close_work was canceled before
  initialization.

    WARNING: CPU: 7 PID: 111103 at ke…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/smc: initialize close_work early to avoid warning

  We encountered a warning that close_work was canceled before
  initialization.

    WARNING: CPU: 7 PID: 111103 at ke…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-665
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.12, < 6.6.66'
  - 'linux_kernel >= 6.7, < 6.12.5'
  - linux_kernel = 6.13
patched:
  - linux_kernel 6.12.5
published: '2024-12-27'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:18:02.013'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-56641'
references:
  - url: 'https://git.kernel.org/stable/c/0541db8ee32c09463a72d0987382b3a3336b0043'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6638e52dcfafaf1b9cbc34544f0c832db0069ea1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f0c37002210aaede10dae849d1a78efc2243add2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56641.json
  - url: 'https://access.redhat.com/security/cve/CVE-2024-56641'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2334558'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2024-56641'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2024-56641'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2024122736-CVE-2024-56641-5492@gregkh/T
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00515
epssPercentile: 0.43676
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-15T21:41:11.352533Z'
scores:
  nvd: 7.5
  vendor: 3.3
  cna: 7.5
ingestedAt: '2026-10-15T22:48:25.445Z'
---

## Overview

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

net/smc: initialize close_work early to avoid warning

We encountered a warning that close_work was canceled before
initialization.

  WARNING: CPU: 7 PID: 111103 at kernel/workqueue.c:3047 __flush_work+0x19e/0x1b0
  Workqueue: events smc_lgr_terminate_work [smc]
  RIP: 0010:__flush_work+0x19e/0x1b0
  Call Trace:
   ? __wake_up_common+0x7a/0x190
   ? work_busy+0x80/0x80
   __cancel_work_timer+0xe3/0x160
   smc_close_cancel_work+0x1a/0x70 [smc]
   smc_close_active_abort+0x207/0x360 [smc]
   __smc_lgr_terminate.part.38+0xc8/0x180 [smc]
   process_one_work+0x19e/0x340
   worker_thread+0x30/0x370
   ? process_one_work+0x340/0x340
   kthread+0x117/0x130
   ? __kthread_cancel_work+0x50/0x50
   ret_from_fork+0x22/0x30

This is because when smc_close_cancel_work is triggered, e.g. the RDMA
driver is rmmod and the LGR is terminated, the conn->close_work is
flushed before initialization, resulting in WARN_ON(!work->func).

__smc_lgr_terminate             | smc_connect_{rdma|ism}
-------------------------------------------------------------
                                | smc_conn_create
				| \- smc_lgr_register_conn
for conn in lgr->conns_all      |
\- smc_conn_kill                |
   \- smc_close_active_abort    |
      \- smc_close_cancel_work  |
         \- cancel_work_sync    |
            \- __flush_work     |
	         (close_work)   |
	                        | smc_close_init
	                        | \- INIT_WORK(&close_work)

So fix this by initializing close_work before establishing the
connection.

## Affected

- `linux_kernel >= 4.12, < 6.6.66`
- `linux_kernel >= 6.7, < 6.12.5`
- `linux_kernel = 6.13`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.12.5`

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56641.json)