CVE-2026-31668 — CVE-2026-31668 | In the Linux kernel, the following vulnerability has been resolved: seg… — CVE & Security Advisory Radar

🎯 CVE-2026-31668 🇪🇺 EUVD

💬 0 Diskussion 📄 .md Alle CVEs anzeigen ✕

CVE-2026-31668 | In the Linux kernel, the following vulnerability has been resolved: seg6: separate dst_cache for input and output paths in seg6 lwtunnel The seg6 lwtunnel uses a single dst_cache per encap route, shared between seg6_input_core() and seg6_output_core(). These two paths can perform the post-encap SID lookup in different routing contexts (e.g., ip rules matching on the ingress interface, or VRF table separation). Whichever path runs first populates the cache,

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

seg6: separate dst_cache for input and output paths in seg6 lwtunnel

The seg6 lwtunnel uses a single dst_cache per encap route, shared
between seg6_input_core() and seg6_output_core(). These two paths
can perform the post-encap SID lookup in different routing contexts
(e.g., ip rules matching on the ingress interface, or VRF table
separation). Whichever path runs first populates the cache, and the
other reuses it blindly, bypassing its own lookup.

Fix this by splitting the cache into cache_input and cache_output,
so each path maintains its own cached dst independently.

Klassifikation & Betroffenheit:

Linux Linux 4.10Linux 6c8702c60b88651072460f3f4026c7dfe2521d12 <84d458018b147176b259347103fccb7e93abd2b1Linux patch: 6.1.169Linux patch: 5.15.203Linux patch: 6.6.135Linux 6c8702c60b88651072460f3f4026c7dfe2521d12 <17d87d42874f5d6c1a0ccc6d9190dfe82a9a7a6aLinux patch: 0Linux patch: 6.12.82

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-2026-74705 10.0 CVE-2026-74612 10.0 CVE-2026-74475 10.0 CVE-2026-74309 10.0 CVE-2026-74280 10.0

🩹 Patch verfügbar (OSV):

🩹 Kernel ≥ 5.10.253 🩹 Kernel ≥ 5.15.203 🩹 Kernel ≥ 6.1.169 🩹 Kernel ≥ 6.6.135 🩹 Kernel ≥ 6.12.82 🩹 Kernel ≥ 6.18.23

🇩🇪 BSI-Sicherheitshinweise: BSI · hoch · Linux Kernel: Mehrere Schwachstellen ↗

📚 Referenzen & Quellen:

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

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 04/2026

Heute 09.10.

CVSS-Vektor-Analyse: 9.8

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Keine

UI · Interaktion Keine

S · Scope Unverändert

C · Vertraulichkeit Hoch

I · Integrität Hoch

A · Verfügbarkeit Hoch

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

Veröffentlicht:24.04.2026

Aktualisiert:05.08.2026 12:24

Assigner (CNA):Linux

EUVD-ID:EUVD-2026-25561

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

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

Tier	CVEs	Anteil
≥90 %	720	0,2 %
≥50 %	3.223	0,9 %
≥10 %	22.114	6,0 %
<10 %	341.998	92,9 %

9.8 CRITICAL

EPSS

0.8%

CVE-2026-31668 🌐 Netzwerk (Remote) 🔓 Keine Authentifizierung nötig

Linux

CVE-2026-31668 | In the Linux kernel, the following vulnerability has been resolved: seg6: separate dst_cache for input and output paths in seg6 lwtunnel The seg6 lwtunnel uses a single dst_cache per encap route, shared between seg6_input_core() and seg6_output_core(). These two paths can perform the post-encap SID lookup in different routing contexts (e.g., ip rules matching on the ingress interface, or VRF table separation). Whichever path runs first populates the cache,

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

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

24.04.2026

🛡️ Details ➔

Noch keine Analyse zu CVE-2026-31668

Beitrag zu CVE-2026-31668 verfassen

Zero-Day & Vulnerability Intelligence Hub