tcpmss_mangle_packet of the file net/netfilter/xt_TCPMSS.c. Upgrading to version 4.9.36 or 4.11 eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.
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Linux Kernel up to 4.9.35/4.10 xt_TCPMSS.c tcpmss_mangle_packet Packet memory corruption
A vulnerability classified as critical has been found in Linux Kernel up to 4.9.35/4.10 (Operating System). This affects the function tcpmss_mangle_packet of the file net/netfilter/xt_TCPMSS.c. Upgrading to version 4.9.36 or 4.11…
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A vulnerability classified as critical has been found in Linux Kernel up to 4.9.35/4.10 (Operating System). This affects the function
1. Sofort-Triage & Abwehrmaßnahmen
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1-Click Detection Engineering: Multi-Dialect SIEM Rules5 Formate
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Syntax validiert (0 Fehler)
title: Detect Exploitation - Linux Kernel up to 4.9.35/4.10 xt_TCPMSS.c tcpmss_mangle_packet Packet memory corruption
id: f7c3be5c-fc08-4dcf-9f96-452df2d6aa22
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-26
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_accessSyntax validiert (0 Fehler)
rule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-26"
description = "YARA Signature for "
strings:
$str = "Linux Kernel up to 4.9.35/4.10" ascii wide
condition:
any of them
}Syntax validiert (0 Fehler)
index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("Linux Kernel up to 4935410 xt_TCPMSSc tc")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - countSyntax validiert (0 Fehler)
message: "*Linux Kernel up to 4935410 xt_TCPMSSc tc*"Syntax validiert (0 Fehler)
CommonSecurityLog
| where Message has "Linux Kernel up to 4935410 xt_TCPMSSc tc"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc2. Cyber Threat Intelligence & Forensik
CTI Threat Relationship Graph2 Knoten / 1 Relationen
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MITRE ATT&CK Matrix Navigator 14 Taktiken
Reconnaissance
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Resource Development
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Initial Access
Execution
Persistence
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Privilege Escalation
Defense Evasion
Credential Access
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Discovery
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Lateral Movement
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Collection
-
Command and Control
Exfiltration
-
Impact
tsecurity.de Cognitive Threat RAG
Fokus-Vektor:
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich Linux Kernel up to 4.9.35/4.10 xt_TCPMSS.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
🛡️ Angriffsfläche & Exposure
Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.
⚡ Empfohlene Sofortmaßnahmen
- 1. Perimeter-Inspektion: Relevante Portfreigaben und exponierte Endpunkte unverzüglich scannen.
- 2. Patch-Applikation: Hersteller-Hotfix einspielen oder betroffene Daemons in isolierte DMZ-Segmente überführen.
- 3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.
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