CVE-2024-40959

Local system crash via unchecked network-device pointer

Published Jul 12, 2024 · Updated May 12, 2026

A NULL pointer dereference in Linux IPv6 XFRM source-address selection allows local users to crash affected systems. In xfrm6_get_saddr(), the kernel dereferences the network device returned by ip6_dst_idev() without first checking whether that function returned NULL. Reaching the fault requires low-privileged local access and an IPv6 XFRM route-resolution path; the demonstrated consequence is a kernel fault and service interruption.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in Linux IPv6 XFRM source-address selection allows local users to crash affected systems. In xfrm6_get_saddr(), the kernel dereferences the network device returned by ip6_dst_idev() without first checking whether that function returned NULL. Reaching the fault requires low-privileged local access and an IPv6 XFRM route-resolution path; the demonstrated consequence is a kernel fault and service interruption.

The record

CVE
CVE-2024-40959
Published
Jul 12, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 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=V3.1.0 <V3.1.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.0 <V3.1.5
Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <20427b85781aca0ad072851f6907a3d4b2fed8d1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <600a62b4232ac027f788c3ca395bc2333adeaacf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <83c02fb2cc0afee5bb53cddf3f34f045f654ad6a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9f30f1f1a51d91e19f5a09236bb0b59e6a07ad08; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c71761292d4d002a8eccb57b86792c4e3b3eb3c7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <caf0bec84c62fb1cf6f7c9f0e8c857c87f8adbc3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d46401052c2d5614da8efea5788532f0401cb164; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f897d7171652fcfc76d042bfec798b010ee89e41; version=2.6.12
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.0 <V3.1.5
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.0 <V3.1.5

Published CVSS scores

5.5Siemens ProductCERTCVSS: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
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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