CVE-2026-74657 — CVE & Security Advisory Radar

🎯 CVE-2026-74657 LOW 3.1 🔥 EPSS 2.7%

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CVE-2026-74657: Schwachstellen-Eintrag (NVD)

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

ipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops

fib_nlmsg_size() still estimates nexthop space as if every gateway is
encoded as an IPv4 RTA_GATEWAY attribute. IPv4 routes can also carry an
IPv6 gateway, which fib_nexthop_info() dumps as RTA_VIA.

As a result, route notifications can allocate an skb that is too small.
fib_dump_info() then fails with -EMSGSIZE and rtmsg_fib() hits the
WARN_ON() that marks such failures as a fib_nlmsg_size() bug. With
panic_on_warn set, this becomes a kernel panic.

Mirror the actual nexthop dump layout in fib_nlmsg_size(): account for
IPv6 nexthop gateways dumped as RTA_VIA, for the no-header rtnexthop
layout used inside RTA_MULTIPATH, and for RTA_FLOW only when it is
actually present.

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-2021-47476 4.6 CVE-2024-24857 4.6 CVE-2024-24858 4.6 CVE-2024-24859 4.6 CVE-2024-24860 4.6

🩹 Patch verfügbar (OSV):

🩹 Kernel ≥ 5.10.267 🩹 Kernel ≥ 5.15.216 🩹 Kernel ≥ 6.1.183 🩹 Kernel ≥ 6.6.152 🩹 Kernel ≥ 6.12.104 🩹 Kernel ≥ 6.18.45

📰 Eigene Berichterstattung: ➔ CVE-2026-74657 | Linux Kernel up to 7.1.8 ipv4 fib_nlmsg_size/fib_nexthop_info b

📚 Referenzen & Quellen:

🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 08/2026

Heute 07.09.

Veröffentlicht:22.08.2026

Aktualisiert:27.08.2026 13:18

Assigner (CNA):NVD

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

Datenquellen & Methodik: Primärquelle ist die EUVD der ENISA (laufender Datenbank-Sync, alle 15 Minuten), abgeglichen mit dem CISA-KEV-Katalog und der NVD — Detail-Dossiers reichern fehlende Felder live per NVD an — mit Fallback auf CIRCL vulnerability-lookup (EU/Non-Profit, aggregiert CVE-, GitHub- und OSV-Advisories). Der CISA-KEV-Katalog (Known Exploited Vulnerabilities, ~1.700 aktiv ausgenutzte Schwachstellen) wird bei jedem Sync vollständig neu geladen und kreuzreferenziert — filterbar über die KEV-Pille. CVSS 3.1 wird nach Ampel-Logik aus Verteidigersicht dekodiert; EPSS bezeichnet die 30-Tage-Exploit-Wahrscheinlichkeit (FIRST.org).

🇪🇺 ENISA EUVD 🇺🇸 NVD ⚠️ CISA KEV ⚡ EPSS

7.5 HIGH

EPSS

18.7%

CVE-2026-74657 💻 Lokal 🔓 Keine Authentifizierung nötig

Linux

CVE-2026-74657 | Linux Kernel up to 7.1.8 ipv4 fib_nlmsg_size/fib_nexthop_info buffer size (Nessus ID 343049)

A vulnerability, which was classified as critical, was found in Linux Kernel up to 7.1.8. Affected by this vulnerability is the function fib_nlmsg_size/fib_nexthop_info of the component ipv4. Executing a manipulation can lead to incorrect c

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

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

07.09.2026

🛡️ Details ➔

CVE-2026-74657: Schwachstellen-Eintrag (NVD)

Zero-Day & Vulnerability Intelligence Hub

CVE-2026-74657 | Linux Kernel up to 7.1.8 ipv4 fib_nlmsg_size/fib_nexthop_info buffer size (Nessus ID 343049)