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

Vulnerability from cvelistv5 – Published: 2026-02-14 16:01 – Updated: 2026-02-14 16:01
VLAI?
Title
net: fix segmentation of forwarding fraglist GRO
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 3e62db1e3140449608975e29e0979cc5f3b1cc07 (git)
Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 3d48d59235c494d34e32052f768393111c0806ef (git)
Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 426ca15c7f6cb6562a081341ca88893a50c59fa2 (git)
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    Linux 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)
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{
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "net/core/filter.c",
            "net/ipv4/tcp_offload.c",
            "net/ipv4/udp_offload.c",
            "net/ipv6/tcpv6_offload.c"
          ],
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          "vendor": "Linux",
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            "net/ipv6/tcpv6_offload.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
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              "version": "6.18.9",
              "versionType": "semver"
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              "operator": "OR"
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          "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"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/426ca15c7f6cb6562a081341ca88893a50c59fa2"
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      ],
      "title": "net: fix segmentation of forwarding fraglist GRO",
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  "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",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23154\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-14T16:15:55.550\",\"lastModified\":\"2026-02-14T16:15:55.550\",\"vulnStatus\":\"Received\",\"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.\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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.
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  • 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.



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