CVE-2024-56641

Service interruption via uninitialized close work

Published Dec 27, 2024 · Updated Aug 5, 2026

Improper work initialization in Linux kernel net/smc allows local users to interrupt service by terminating an SMC link group. smc_close_cancel_work passes conn->close_work to cancel_work_sync before smc_close_init assigns its work function, triggering WARN_ON in __flush_work. The demonstrated path requires local access to remove an RDMA driver; the published trace establishes a kernel warning, not a confirmed crash.

CVSS severity5.5
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper work initialization in Linux kernel net/smc allows local users to interrupt service by terminating an SMC link group. smc_close_cancel_work passes conn->close_work to cancel_work_sync before smc_close_init assigns its work function, triggering WARN_ON in __flush_work. The demonstrated path requires local access to remove an RDMA driver; the published trace establishes a kernel warning, not a confirmed crash.

The record

CVE
CVE-2024-56641
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.12
  2. Affected versionversion=46c28dbd4c23c3f7fa37f5ea48772af79c9cc40e <0541db8ee32c09463a72d0987382b3a3336b0043
  3. Affected versionversion=46c28dbd4c23c3f7fa37f5ea48772af79c9cc40e <6638e52dcfafaf1b9cbc34544f0c832db0069ea1
  4. Affected versionversion=46c28dbd4c23c3f7fa37f5ea48772af79c9cc40e <f0c37002210aaede10dae849d1a78efc2243add2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=46c28dbd4c23c3f7fa37f5ea48772af79c9cc40e <0541db8ee32c09463a72d0987382b3a3336b0043; version=46c28dbd4c23c3f7fa37f5ea48772af79c9cc40e <6638e52dcfafaf1b9cbc34544f0c832db0069ea1; version=46c28dbd4c23c3f7fa37f5ea48772af79c9cc40e <f0c37002210aaede10dae849d1a78efc2243add2

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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