CVE-2024-44992Network attack vector

Service interruption via SMB client NULL dereference

Published Sep 4, 2024 · Updated Aug 5, 2026

NULL pointer dereference in the Linux SMB client in Linux 6.10 allows remote attackers to interrupt service via a hostile SMB server. When cifs_free_subrequest releases nonzero credits after rdata->server has become NULL, add_credits_and_wake_if dereferences rdata->server->ops without a NULL guard. An established SMB mount and in-flight read or write subrequests are required; the resulting kernel oops can strand writeback and leave the mount unusable.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux SMB client in Linux 6.10 allows remote attackers to interrupt service via a hostile SMB server. When cifs_free_subrequest releases nonzero credits after rdata->server has become NULL, add_credits_and_wake_if dereferences rdata->server->ops without a NULL guard. An established SMB mount and in-flight read or write subrequests are required; the resulting kernel oops can strand writeback and leave the mount unusable.

The record

CVE
CVE-2024-44992
Published
Sep 4, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 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

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Is a vulnerable build present?

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

  1. Affected versionversion=6.10
  2. Affected versionversion=69c3c023af25edb5433a2db824d3e7cc328f0183 <74c2ab6d653b4c2354df65a7f7f2df1925a40a51
  3. Affected versionversion=69c3c023af25edb5433a2db824d3e7cc328f0183 <fead60a6d5f84b472b928502a42c419253afe6c1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=69c3c023af25edb5433a2db824d3e7cc328f0183 <74c2ab6d653b4c2354df65a7f7f2df1925a40a51; version=69c3c023af25edb5433a2db824d3e7cc328f0183 <fead60a6d5f84b472b928502a42c419253afe6c1

Published CVSS scores

7.5Linux Kernel CVE TeamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5NISTCVSS: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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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