CVE-2024-50045

Kernel crash via invalid tunnel destination dereference

Published Oct 21, 2024 · Updated Aug 5, 2026

NULL pointer dereference in the Linux kernel allows local users to crash the kernel through oversized untagged VxLAN traffic. In br_nf_dev_queue_xmit, fragmentation reaches ip_dst_mtu after br_handle_egress_vlan_tunnel replaces skb_dst with metadata whose dst.dev is NULL. Exposure requires br_netfilter, bridge-nf-call-iptables=1, a single-VxLAN-device bridge port, and forwarded untagged frames larger than its MTU.

CVSS severity5.5
Medium
EPSS probability0.61%
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 kernel allows local users to crash the kernel through oversized untagged VxLAN traffic. In br_nf_dev_queue_xmit, fragmentation reaches ip_dst_mtu after br_handle_egress_vlan_tunnel replaces skb_dst with metadata whose dst.dev is NULL. Exposure requires br_netfilter, bridge-nf-call-iptables=1, a single-VxLAN-device bridge port, and forwarded untagged frames larger than its MTU.

The record

CVE
CVE-2024-50045
Published
Oct 21, 2024
Updated
Aug 5, 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. Oct 21, 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=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 · 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=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd <3453f5839420bfbb85c86c61e49f49ffd0f041c4; version=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd <75dfcb758015c97e1accd6340691fca67d363bed; version=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd <78ed917133b118661e1fe62d4a85d5d428ee9568; version=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd <915717e0bb9837cc5c101bc545af487bd787239e; version=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd <95c0cff5a1a5d28bf623b92eb5d1a8f56ed30803; version=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd <cce8419b8168f6e7eb637103a47f916f3de8bc81; version=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd <f07131239a76cc10d5e82c19d91f53cb55727297; version=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd <f9ff7665cd128012868098bbd07e28993e314fdb; version=4.11
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 <V3.2
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.2
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.0 <V3.1.5

Published CVSS scores

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