Vulnerability-Lookup

FKIE_CVE-2026-23154

Vulnerability from fkie_nvd - Published: 2026-02-14 16:15 - Updated: 2026-02-18 17:52

Severity ?

Summary

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. 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.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3d48d59235c494d34e32052f768393111c0806ef
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3e62db1e3140449608975e29e0979cc5f3b1cc07
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/426ca15c7f6cb6562a081341ca88893a50c59fa2

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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\u0027s 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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: corrige la segmentaci\u00f3n de reenv\u00edo 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 estaci\u00f3n accede a servidores IPv4 a trav\u00e9s de hotspots con una interfaz upstream solo IPv6.\n\nEspec\u00edficamente, corrige un error en la segmentaci\u00f3n GSO al reenviar paquetes GRO que contienen un frag_list. La funci\u00f3n 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 expl\u00edcitamente el flag SKB_GSO_DODGY para paquetes GSO en los helpers de traducci\u00f3n 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 despu\u00e9s de la traducci\u00f3n de protocolo. Como resultado, la segmentaci\u00f3n GSO evitar\u00e1 usar skb_segment_list y en su lugar recurrir\u00e1 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."
    }
  ],
  "id": "CVE-2026-23154",
  "lastModified": "2026-02-18T17:52:44.520",
  "metrics": {},
  "published": "2026-02-14T16:15:55.550",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3d48d59235c494d34e32052f768393111c0806ef"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3e62db1e3140449608975e29e0979cc5f3b1cc07"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/426ca15c7f6cb6562a081341ca88893a50c59fa2"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

CVE-2026-23154 (GCVE-0-2026-23154)

Vulnerability from cvelistv5 – Published: 2026-02-14 16:01 – Updated: 2026-02-14 16:01

Title

net: fix segmentation of forwarding fraglist GRO

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/3e62db1e314044960…
	https://git.kernel.org/stable/c/3d48d59235c494d34…
	https://git.kernel.org/stable/c/426ca15c7f6cb6562…

Impacted products

Vendor

Product

Version

Linux

Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 3e62db1e3140449608975e29e0979cc5f3b1cc07 (git)
Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 3d48d59235c494d34e32052f768393111c0806ef (git)
Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 426ca15c7f6cb6562a081341ca88893a50c59fa2 (git)

Linux

Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 6.12.69 , ≤ 6.12.* (semver)
Unaffected: 6.18.9 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/filter.c",
            "net/ipv4/tcp_offload.c",
            "net/ipv4/udp_offload.c",
            "net/ipv6/tcpv6_offload.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3e62db1e3140449608975e29e0979cc5f3b1cc07",
              "status": "affected",
              "version": "9fd1ff5d2ac7181844735806b0a703c942365291",
              "versionType": "git"
            },
            {
              "lessThan": "3d48d59235c494d34e32052f768393111c0806ef",
              "status": "affected",
              "version": "9fd1ff5d2ac7181844735806b0a703c942365291",
              "versionType": "git"
            },
            {
              "lessThan": "426ca15c7f6cb6562a081341ca88893a50c59fa2",
              "status": "affected",
              "version": "9fd1ff5d2ac7181844735806b0a703c942365291",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/filter.c",
            "net/ipv4/tcp_offload.c",
            "net/ipv4/udp_offload.c",
            "net/ipv6/tcpv6_offload.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.6"
            },
            {
              "lessThan": "5.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.69",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.69",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.9",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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\u0027s 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-14T16:01:21.758Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3e62db1e3140449608975e29e0979cc5f3b1cc07"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d48d59235c494d34e32052f768393111c0806ef"
        },
        {
          "url": "https://git.kernel.org/stable/c/426ca15c7f6cb6562a081341ca88893a50c59fa2"
        }
      ],
      "title": "net: fix segmentation of forwarding fraglist GRO",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23154",
    "datePublished": "2026-02-14T16:01:21.758Z",
    "dateReserved": "2026-01-13T15:37:45.977Z",
    "dateUpdated": "2026-02-14T16:01:21.758Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-23154

CVE-2026-23154 (GCVE-0-2026-23154)

Tags

Sightings

Nomenclature