qat_4xxx. The manipulation leads to use after free.This vulnerability is referenced as CVE-2025-39721. The attack needs to be initiated within the local network. No exploit is available.
The affected component should be upgraded.
Intelligence View
⚡ tsecurity.de Intelligence
CVE-2025-39721 | Linux Kernel up to 6.6.102/6.12.43/6.16.3 qat_4xxx use after free (Nessus ID 261633)
A vulnerability labeled as critical has been found in Linux Kernel up to 6.6.102/6.12.43/6.16.3. The affected element is the function qat_4xxx. The manipulation leads to use after free. This vulnerability is referenced as CVE-2025-39721.…
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A vulnerability labeled as critical has been found in Linux Kernel up to 6.6.102/6.12.43/6.16.3. The affected element is the function
This vulnerability is referenced as CVE-2025-39721. The attack needs to be initiated within the local network. No exploit is available.
The affected component should be upgraded.
This vulnerability is referenced as CVE-2025-39721. The attack needs to be initiated within the local network. No exploit is available.
The affected component should be upgraded.
IoC Intelligence (1 Indikatoren)
CVE-2025-39721
CTI Threat Relationship Graph2 Knoten / 1 Relationen
IR-PLAYBOOK-VULN-REMEDIATIONMEDIUM
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title: Detect Exploitation - CVE-2025-39721 | Linux Kernel up to 6.6.102/6.12.43/6.16.3 qat_4xxx use after free (Nessus ID 261633)
id: e1fd3e9b-1b19-4985-a507-14ab5268e970
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-24
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_accessrule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-24"
description = "YARA Signature for "
strings:
$str = "CVE-2025-39721 | Linux Kernel " ascii wide
condition:
any of them
}INFRASTRUCTURE BLAST RADIUS & EXPOSURE
Live-Vektor: LOCAL
LOCALIZED
Perimeter & Ingress
Geringes Risiko
Lateral Pivot & AD
Geringes Risiko
Crown Jewels & DB
Geringes Risiko
Supply Chain Reach
GEFÄHRDET (90%)
tsecurity.de Cognitive Threat RAG
Fokus-Vektor:
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich CVE-2025-39721 | Linux Kernel up to 6.6..... 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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