CVE-2024-38558Network attack vector

Packet action corruption via ICMPv6 tuple overwrite

Published Jun 19, 2024 · Updated Aug 5, 2026

Improper input validation in Linux Open vSwitch 4.11 and later allows remote attackers to corrupt packet processing through crafted ICMPv6 traffic. During OVS_PACKET_CMD_EXECUTE parsing, flow.c clears the shared ipv6.nd union member for non-ND packets, overwriting most of ct_orig's destination address. Exploitation requires conntrack state and recirculation or userspace reinjection; direct interface ingress is unaffected, while a match on the corrupted tuple can execute the wrong action.

CVSS severity10.0
Critical
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Linux Open vSwitch 4.11 and later allows remote attackers to corrupt packet processing through crafted ICMPv6 traffic. During OVS_PACKET_CMD_EXECUTE parsing, flow.c clears the shared ipv6.nd union member for non-ND packets, overwriting most of ct_orig's destination address. Exploitation requires conntrack state and recirculation or userspace reinjection; direct interface ingress is unaffected, while a match on the corrupted tuple can execute the wrong action.

The record

CVE
CVE-2024-38558
Published
Jun 19, 2024
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-20, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 19, 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=0 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=4.11; version=9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc <0b532f59437f688563e9c58bdc1436fefa46e3b5; version=9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc <431e9215576d7b728f3f53a704d237a520092120; version=9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc <483eb70f441e2df66ade78aa7217e6e4caadfef3; version=9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc <5ab6aecbede080b44b8e34720ab72050bf1e6982; version=9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc <6a51ac92bf35d34b4996d6eb67e2fe469f573b11; version=9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc <78741b4caae1e880368cb2f5110635f3ce45ecfd; version=9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc <7c988176b6c16c516474f6fceebe0f055af5eb56; version=9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc <9ec8b0ccadb908d92f7ee211a4eff05fd932f3f6; version=9dd7f8907c3705dc7a7a375d1c6e30b06e6daffc <d73fb8bddf89503c9fae7c42e50d44c89909aad6
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1

Published CVSS scores

5.5National Vulnerability DatabaseCVSS: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
10.0Linux Kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
4.4SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

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-20Improper Input Validation
T1565.002Transmitted Data Manipulation

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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