CVE-2026-23154 (GCVE-0-2026-23154)
Vulnerability from cvelistv5
Published
2026-02-14 16:01
Modified
2026-03-25 10:20
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
Impacted products
Vendor Product Version
Linux Linux Version: 9fd1ff5d2ac7181844735806b0a703c942365291
Version: 9fd1ff5d2ac7181844735806b0a703c942365291
Version: 9fd1ff5d2ac7181844735806b0a703c942365291
Version: 9fd1ff5d2ac7181844735806b0a703c942365291
Version: 9fd1ff5d2ac7181844735806b0a703c942365291
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{
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      "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": "2026-03-25T10:20:26.462Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/9122d7280b2303e835cdfec156bd932ac1f586ed"
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          "url": "https://git.kernel.org/stable/c/2cbef9ea5a0ac51863ede35c45f26931a85d3888"
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        },
        {
          "url": "https://git.kernel.org/stable/c/3d48d59235c494d34e32052f768393111c0806ef"
        },
        {
          "url": "https://git.kernel.org/stable/c/426ca15c7f6cb6562a081341ca88893a50c59fa2"
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      ],
      "title": "net: fix segmentation of forwarding fraglist GRO",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23154",
    "datePublished": "2026-02-14T16:01:21.758Z",
    "dateReserved": "2026-01-13T15:37:45.977Z",
    "dateUpdated": "2026-03-25T10:20:26.462Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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