CVE-2026-23154
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net: fix segmentation of forwarding fraglist GRO
This patch enhances GSO segment handling by properly checking the SKB_GSO_DODGY flag for frag_list GSO packets, addressing low throughput issues observed when a station accesses IPv4 servers via hotspots with an IPv6-only upstream interface.
Specifically, it fixes a bug in GSO segmentation when forwarding GRO packets containing a frag_list. The function skb_segment_list cannot correctly process GRO skbs that have been converted by XLAT, since XLAT only translates the header of the head skb. Consequently, skbs in the frag_list may remain untranslated, resulting in protocol inconsistencies and reduced throughput.
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To address this, the patch explicitly sets the SKB_GSO_DODGY flag for GSO packets in XLAT's IPv4/IPv6 protocol translation helpers (bpf_skb_proto_4_to_6 and bpf_skb_proto_6_to_4). This marks GSO packets as potentially modified after protocol translation. As a result, GSO segmentation will avoid using skb_segment_list and instead falls back to skb_segment for packets with the SKB_GSO_DODGY flag. This ensures that only safe and fully translated frag_list packets are processed by skb_segment_list, resolving protocol inconsistencies and improving throughput when forwarding GRO packets converted by XLAT.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.12%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 5/10/2026
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).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/2cbef9ea5a0ac51863ede35c45f26931a85d3888
- https://git.kernel.org/stable/c/3d48d59235c494d34e32052f768393111c0806ef
- https://git.kernel.org/stable/c/3e62db1e3140449608975e29e0979cc5f3b1cc07
- https://git.kernel.org/stable/c/426ca15c7f6cb6562a081341ca88893a50c59fa2
- https://git.kernel.org/stable/c/9122d7280b2303e835cdfec156bd932ac1f586ed
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
JSON original (NVD)
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix segmentation of forwarding fraglist GRO\n\nThis patch enhances GSO segment handling by properly checking\nthe SKB_GSO_DODGY flag for frag_list GSO packets, addressing\nlow throughput issues observed when a station accesses IPv4\nservers via hotspots with an IPv6-only upstream interface.\n\nSpecifically, it fixes a bug in GSO segmentation when forwarding\nGRO packets containing a frag_list. The function skb_segment_list\ncannot correctly process GRO skbs that have been converted by XLAT,\nsince XLAT only translates the header of the head skb. Consequently,\nskbs in the frag_list may remain untranslated, resulting in protocol\ninconsistencies and reduced throughput.\n\nTo address this, the patch explicitly sets the SKB_GSO_DODGY flag\nfor GSO packets in XLAT's IPv4/IPv6 protocol translation helpers\n(bpf_skb_proto_4_to_6 and bpf_skb_proto_6_to_4). This marks GSO\npackets as potentially modified after protocol translation. As a\nresult, GSO segmentation will avoid using skb_segment_list and\ninstead falls back to skb_segment for packets with the SKB_GSO_DODGY\nflag. This ensures that only safe and fully translated frag_list\npackets are processed by skb_segment_list, resolving protocol\ninconsistencies and improving throughput when forwarding GRO packets\nconverted by XLAT."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: corrige la segmentación de reenvío de fraglist GRO\n\nEste parche mejora el manejo de segmentos GSO al verificar correctamente el flag SKB_GSO_DODGY para paquetes GSO con frag_list, abordando problemas de bajo rendimiento observados cuando una estación accede a servidores IPv4 a través de hotspots con una interfaz upstream solo IPv6.\n\nEspecíficamente, corrige un error en la segmentación GSO al reenviar paquetes GRO que contienen un frag_list. La función skb_segment_list no puede procesar correctamente los skbs GRO que han sido convertidos por XLAT, ya que XLAT solo traduce la cabecera del skb principal. Consecuentemente, los skbs en el frag_list pueden permanecer sin traducir, lo que resulta en inconsistencias de protocolo y un rendimiento reducido.\n\nPara abordar esto, el parche establece explícitamente el flag SKB_GSO_DODGY para paquetes GSO en los helpers de traducción de protocolo IPv4/IPv6 de XLAT (bpf_skb_proto_4_to_6 y bpf_skb_proto_6_to_4). Esto marca los paquetes GSO como potencialmente modificados después de la traducción de protocolo. Como resultado, la segmentación GSO evitará usar skb_segment_list y en su lugar recurrirá a skb_segment para paquetes con el flag SKB_GSO_DODGY. Esto asegura que solo los paquetes frag_list seguros y completamente traducidos sean procesados por skb_segment_list, resolviendo inconsistencias de protocolo y mejorando el rendimiento al reenviar paquetes GRO convertidos por XLAT."
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"lastModified": "2026-07-14T13:18:26.587",
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