CVE-2024-44989

Local kernel crash via bonding XFRM race

Published Sep 4, 2024 · Updated May 12, 2026

NULL pointer dereference in Linux kernel bonding allows local users to crash affected Linux and Siemens device kernels through XFRM traffic. Bonding code clears a slave's real_dev while packets remain in transit, allowing xdo_dev_offload_ok() to invoke a callback that dereferences the null device pointer. Exploitation requires low-privileged local access and a race between bond slave changes and in-transit XFRM processing; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.24%
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 Linux kernel bonding allows local users to crash affected Linux and Siemens device kernels through XFRM traffic. Bonding code clears a slave's real_dev while packets remain in transit, allowing xdo_dev_offload_ok() to invoke a callback that dereferences the null device pointer. Exploitation requires low-privileged local access and a race between bond slave changes and in-transit XFRM processing; the bounded consequence is a kernel crash.

The record

CVE
CVE-2024-44989
Published
Sep 4, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2024CVE publishedPublication date reported by the CVE source.
  2. May 12, 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=0 <V3.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 familyversion=0 <V3.2
Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=18cb261afd7bf50134e5ccacc5ec91ea16efadd4 <21816b696c172c19d53a30d45ee005cce246ed21; version=18cb261afd7bf50134e5ccacc5ec91ea16efadd4 <2f72c6a66bcd7e0187ec085237fee5db27145294; version=18cb261afd7bf50134e5ccacc5ec91ea16efadd4 <4582d4ff413a07d4ed8a4823c652dc5207760548; version=18cb261afd7bf50134e5ccacc5ec91ea16efadd4 <7fa9243391ad2afe798ef4ea2e2851947b95754f; version=18cb261afd7bf50134e5ccacc5ec91ea16efadd4 <89fc1dca79db5c3e7a2d589ecbf8a3661c65f436; version=18cb261afd7bf50134e5ccacc5ec91ea16efadd4 <f8cde9805981c50d0c029063dc7d82821806fc44; version=5.9
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1; version=0 <V3.2
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1; version=0 <V3.2

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

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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