CVE-2026-80844 — CVE & Security Advisory Radar

🎯 CVE-2026-80844 🇪🇺 EUVD

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CVE-2026-80844 | In the Linux kernel, the following vulnerability has been resolved: xfrm: ah6: validate routing header segments_left AH6 rearranges routing-header addresses before computing or verifying the ICV. ipv6_rearrange_rthdr() assumes that segments_left is not larger than the number of addresses described by the routing header's hdrlen field. That assumption does not hold for raw IPv6 HDRINCL packets. A packet with hdrlen equal to 2 describes one address, but can

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

xfrm: ah6: validate routing header segments_left

AH6 rearranges routing-header addresses before computing or verifying the
ICV. ipv6_rearrange_rthdr() assumes that segments_left is not larger than
the number of addresses described by the routing header's hdrlen field.

That assumption does not hold for raw IPv6 HDRINCL packets. A packet with
hdrlen equal to 2 describes one address, but can carry an arbitrary
segments_left value. With segments_left equal to 255, the function moves
its address pointer 4,064 bytes backwards and passes a 4,064-byte length to
memmove(), resulting in an out-of-bounds access.

Validate the invariant locally before modifying the routing header or
performing any address-pointer arithmetic, and propagate malformed-header
errors to the existing AH6 input and output error paths.

Klassifikation & Betroffenheit:

Linux Linux patch: 5.10.269Linux patch: 6.1.187Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <48b0e36cf54358276ee7aa897034c973097d2bc9Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1516e31ac458a738be485620579d8f7fb2700fcbLinux patch: 7.1.13Linux patch: 7.3-rc1Linux patch: 6.6.156Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2dc650956e4e163b879b3fb1027f9557abc5c985

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

🧪 Exploit-Evidenz:

🐙 0xBlackash/CVE-2026-80844

🩹 Patch verfügbar (OSV):

🩹 Kernel ≥ 5.10.269 🩹 Kernel ≥ 5.15.220 🩹 Kernel ≥ 6.1.187 🩹 Kernel ≥ 6.6.156 🩹 Kernel ≥ 6.12.108 🩹 Kernel ≥ 6.18.49

📰 Eigene Berichterstattung: ➔ CVE-2026-80844 | Linux Kernel up to 7.2.2 xfrm ipv6_rearrange_rthdr out-of-bound

📚 Referenzen & Quellen:

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

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 09/2026

Heute 20.09.

Veröffentlicht:04.09.2026

Aktualisiert:04.09.2026 16:18

Assigner (CNA):Linux

EUVD-ID:EUVD-2026-71294

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	2026-08-31	2026-09-19
≥90 %	0	538
≥50 %	0	1603
≥10 %	0	17
<10 %	300	56400

EPSS

0.2%

CVE-2026-80844 💻 Lokal 🔓 Keine Authentifizierung nötig

Linux

CVE-2026-80844 | In the Linux kernel, the following vulnerability has been resolved: xfrm: ah6: validate routing header segments_left AH6 rearranges routing-header addresses before computing or verifying the ICV. ipv6_rearrange_rthdr() assumes that segments_left is not larger than the number of addresses described by the routing header's hdrlen field. That assumption does not hold for raw IPv6 HDRINCL packets. A packet with hdrlen equal to 2 describes one address, but can

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

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

04.09.2026

🛡️ Details ➔

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