CVE-2026-74649 — CVE & Security Advisory Radar

🎯 CVE-2026-74649 HIGH 8.8 🔥 EPSS 24.7%

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CVE-2026-74649: Schwachstellen-Eintrag (NVD)

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

staging: rtl8723bs: fix missing shared-key auth challenge length check

The WEP shared-key authentication handler uses the challenge-text
element's attacker-controlled length without checking it against the
fixed 128-byte chg_txt buffer.

In OnAuthClient() the length from rtw_get_ie() - up to 255 - is used
to perform memcpy() into the 128-byte pmlmeinfo->chg_txt, so a
malicious AP sending a malformed WLAN_EID_CHALLENGE element can
overflow/underfill chg_txt by up to 127 bytes. It is reachable over the
air, before association, during shared-key authentication. In the case
of an overflow, the driver can write out of bounds. In the case of an
underfill, the driver can echo stale buffer memory.

The challenge text is defined to be exactly 128 octets, which is
already provided as the WLAN_AUTH_CHALLENGE_LEN define; require the
element to be exactly that length before use.

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 ≥ 5.15.216 🩹 Kernel ≥ 6.1.183 🩹 Kernel ≥ 6.6.152 🩹 Kernel ≥ 6.12.104 🩹 Kernel ≥ 6.18.45 🩹 Kernel ≥ 7.1.9

📰 Eigene Berichterstattung: ➔ CVE-2026-74649 | Linux Kernel up to 7.1.8 rtl8723bs OnAuthClient buffer overflow

📚 Referenzen & Quellen:

🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 08/2026

Heute 07.09.

CVSS-Vektor-Analyse: 8.8

AV · Angriffsvektor Benachbart

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

Veröffentlicht:22.08.2026

Aktualisiert:25.08.2026 06:18

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

CVE-2026-74649: Schwachstellen-Eintrag (NVD)

Zero-Day & Vulnerability Intelligence Hub

CVE-2026-74649 | Linux Kernel up to 7.1.8 rtl8723bs OnAuthClient buffer overflow (Nessus ID 343049)