CVE-2026-46273

Estado: ModificadaAlta (8.6)—

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

ibmveth: Disable GSO for packets with small MSS

Some physical adapters on Power systems do not support segmentation offload when the MSS is less than 224 bytes. Attempting to send such packets causes the adapter to freeze, stopping all traffic until manually reset.

Implement ndo_features_check to disable GSO for packets with small MSS values. The network stack will perform software segmentation instead.

The 224-byte minimum matches ibmvnic commit <f10b09ef687f> ("ibmvnic: Enforce stronger sanity checks on GSO packets") which uses the same physical adapters in SEA configurations.

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The issue occurs specifically when the hardware attempts to perform segmentation (gso_segs > 1) with a small MSS. Single-segment GSO packets (gso_segs == 1) do not trigger the problematic LSO code path and are transmitted normally without segmentation.

Add an ndo_features_check callback to disable GSO when MSS < 224 bytes. Also call vlan_features_check() to ensure proper handling of VLAN packets, particularly QinQ (802.1ad) configurations where the hardware parser may not support certain offload features.

Validated using iptables to force small MSS values. Without the fix, the adapter freezes. With the fix, packets are segmented in software and transmission succeeds. Comprehensive regression testing completedd (MSS tests, performance, stability).

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Puntuación base: 8.6

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.72%
Percentil entre todas las CVEs puntuadas: 52
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access60 %
Impacto principalT1499 Endpoint Denial of Serviceimpact55 %

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo
CWE-400

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nibmveth: Disable GSO for packets with small MSS\n\nSome physical adapters on Power systems do not support segmentation\noffload when the MSS is less than 224 bytes. Attempting to send such\npackets causes the adapter to freeze, stopping all traffic until\nmanually reset.\n\nImplement ndo_features_check to disable GSO for packets with small MSS\nvalues. The network stack will perform software segmentation instead.\n\nThe 224-byte minimum matches ibmvnic\ncommit <f10b09ef687f> (\"ibmvnic: Enforce stronger sanity checks\non GSO packets\")\nwhich uses the same physical adapters in SEA configurations.\n\nThe issue occurs specifically when the hardware attempts to perform\nsegmentation (gso_segs > 1) with a small MSS. Single-segment GSO packets\n(gso_segs == 1) do not trigger the problematic LSO code path and are\ntransmitted normally without segmentation.\n\nAdd an ndo_features_check callback to disable GSO when MSS < 224 bytes.\nAlso call vlan_features_check() to ensure proper handling of VLAN packets,\nparticularly QinQ (802.1ad) configurations where the hardware parser may\nnot support certain offload features.\n\nValidated using iptables to force small MSS values. Without the fix,\nthe adapter freezes. With the fix, packets are segmented in software\nand transmission succeeds. Comprehensive regression testing completedd\n(MSS tests, performance, stability)."
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nibmveth: Deshabilitar GSO para paquetes con MSS pequeño\n\nAlgunos adaptadores físicos en sistemas Power no soportan la descarga de segmentación cuando el MSS es inferior a 224 bytes. Intentar enviar dichos paquetes hace que el adaptador se congele, deteniendo todo el tráfico hasta que se reinicie manualmente.\n\nImplementar ndo_features_check para deshabilitar GSO para paquetes con valores de MSS pequeños. La pila de red realizará la segmentación por software en su lugar.\n\nEl mínimo de 224 bytes coincide con el commit <f10b09ef687f> de ibmvnic ('ibmvnic: Aplicar comprobaciones de cordura más estrictas en los paquetes GSO') que utiliza los mismos adaptadores físicos en configuraciones SEA.\n\nEl problema ocurre específicamente cuando el hardware intenta realizar la segmentación (gso_segs > 1) con un MSS pequeño. Los paquetes GSO de un solo segmento (gso_segs == 1) no activan la ruta de código LSO problemática y se transmiten normalmente sin segmentación.\n\nAñadir una devolución de llamada ndo_features_check para deshabilitar GSO cuando MSS < 224 bytes. También llamar a vlan_features_check() para asegurar el manejo adecuado de los paquetes VLAN, particularmente configuraciones QinQ (802.1ad) donde el analizador de hardware puede no soportar ciertas características de descarga.\n\nValidado usando iptables para forzar valores de MSS pequeños. Sin la corrección, el adaptador se congela. Con la corrección, los paquetes se segmentan por software y la transmisión tiene éxito. Pruebas de regresión exhaustivas completadas (pruebas de MSS, rendimiento, estabilidad)."
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