CVE-2026-43383 — CVE & Security Advisory Radar

🎯 CVE-2026-43383 CRITICAL 9.4 🔥 EPSS 44% 🇪🇺 EUVD

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CVE-2026-43383 | In the Linux kernel, the following vulnerability has been resolved: net/tcp-md5: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

In the Linux kernel, the following vulnerability has been resolved:

net/tcp-md5: Fix MAC comparison to be constant-time

To prevent timing attacks, MACs need to be compared in constant
time. Use the appropriate helper function for this.

Klassifikation & Betroffenheit:

Linux Linux patch: 0Linux patch: 5.15.210Linux patch: 6.12.78Linux cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <ff44ec94d4fc8348600a69de0a8fa1102c23bce8Linux patch: 6.6.130Linux cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <821c8751fdeecdeecabeb11704dd33439c9e4bbcLinux cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <46d0d6f50dab706637f4c18a470aac20a21900d3Linux patch: 7.0

Improper Control of Generation of Code ('Code Injection') 🎯 Medium

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

🛡️ Empfohlene Mitigation: Refactor your program so that you do not have to dynamically generate code.

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-35 · Leverage Executable Code in Non-Executab… (Very High) CAPEC-77 · Manipulating User-Controlled Variables (Very High) CAPEC-242 · Code Injection (High)

🎯 ATT&CK-Techniken (Kill-Chain-Verhalten):

T1027.006 · Obfuscated Files or Information: H… T1027.009 · Obfuscated Files or Information: E… T1564.009 · Hide Artifacts: Resource Forking

🧩 Ähnliche Schwachstellen (Hersteller/Klasse/Score-Band):

CVE-2026-74475 10.0 CVE-2026-74309 10.0 CVE-2026-74280 10.0 CVE-2026-74279 10.0 CVE-2026-72421 10.0

🩹 Patch verfügbar (OSV):

🩹 Kernel ≥ 5.10.253 🩹 Kernel ≥ 5.15.210 🩹 Kernel ≥ 6.1.167 🩹 Kernel ≥ 6.6.130 🩹 Kernel ≥ 6.12.78 🩹 Kernel ≥ 6.18.19

📚 Referenzen & Quellen:

🇪🇺 Original-Eintrag (ENISA EUVD) 🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 05/2026

Heute 07.09.

CVSS-Vektor-Analyse: 9.4

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Keine

UI · Interaktion Keine

S · Scope Unverändert

C · Vertraulichkeit Gering

I · Integrität Hoch

A · Verfügbarkeit Hoch

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

Veröffentlicht:08.05.2026

Aktualisiert:19.06.2026 13:16

Assigner (CNA):Linux

EUVD-ID:EUVD-2026-28689

Quellen: 🇪🇺 EUVD-Datenbank (ENISA) + 🇺🇸 NVD-Anreicherung · 24-h-Cache

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Kernel-Paket aktualisieren (apt upgrade linux-image / yum update kernel) und System neu starten.

Tier	2026-08-29	2026-09-06
≥90 %	4	0
≥50 %	4	0
≥10 %	3	0
<10 %	304	300

9.4 CRITICAL

🇪🇺 EUVD

EPSS

44%

CVE-2026-43383 🌐 Netzwerk (Remote) 🔓 Keine Authentifizierung nötig

Linux

CVE-2026-43383 | In the Linux kernel, the following vulnerability has been resolved: net/tcp-md5: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

In the Linux kernel, the following vulnerability has been resolved: net/tcp-md5: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Kernel-Paket aktualisieren (apt upgrade linux-image / yum update kernel) und System neu starten.

08.05.2026

🛡️ Details ➔

CVE-2026-43383 | In the Linux kernel, the following vulnerability has been resolved: net/tcp-md5: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

Zero-Day & Vulnerability Intelligence Hub

CVE-2026-43383 | In the Linux kernel, the following vulnerability has been resolved: net/tcp-md5: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.