net: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment()

{
  "id": "5a98d63977e8f5e7533e824430644c9fd268f17fd4cf1ae89194e18dbcccd171",
  "url": "https://osv.dev/vulnerability/CVE-2023-54114",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment() As the call trace shows, skb_panic was caused by wrong skb->mac_header in nsh_gso_segment(): invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 3 PID: 2737 Comm: syz Not tainted 6.3.0-next-20230505 #1 RIP: 0010:skb_panic+0xda/0xe0 call Trace: skb_push+0x91/0xa0 nsh_gso_segment+0x4f3/0x570 skb_mac_gso_segment+0x19e/0x270 __skb_gso_segment+0x1e8/0x3c0 validate_xmit_skb+0x452/0x890 validate_xmit_skb_list+0x99/0xd0 sch_direct_xmit+0x294/0x7c0 __dev_queue_xmit+0x16f0/0x1d70 packet_xmit+0x185/0x210 packet_snd+0xc15/0x1170 packet_sendmsg+0x7b/0xa0 sock_sendmsg+0x14f/0x160 The root cause is: nsh_gso_segment() use skb->network_header - nhoff to reset mac_header in skb_gso_error_unwind() if inner-layer protocol gso fails. However, skb->network_header may be reset by inner-layer protocol gso function e.g. mpls_gso_segment. skb->mac_header reset by the inaccurate network_header will be larger than skb headroom. nsh_gso_segment nhoff = skb->network_header - skb->mac_header; __skb_pull(skb,nsh_len) skb_mac_gso_segment mpls_gso_segment skb_reset_network_header(skb);//skb->network_header+=nsh_len return -EINVAL; skb_gso_error_unwind skb_push(skb, nsh_len); skb->mac_header = skb->network_header - nhoff; // skb->mac_header > skb->headroom, cause skb_push panic Use correct mac_offset to restore mac_header and get rid of nhoff.",
    "evidence": "osv:CVE-2023-54114",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.14.316",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "4.19.284",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.244",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.181",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.113",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.30",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.3.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-54114",
      "aliases": [
        "CVE-2023-54114"
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                },
                {
                  "fixed": "d2309e0cb27b6871b273fbc1725e93be62570d86"
                },
                {
                  "fixed": "435855b0831b351cb72cb38369ee33122ce9574c"
                },
                {
                  "fixed": "02b20e0bc0c2628539e9e518dc342787c3332de2"
                },
                {
                  "fixed": "cdd8160dcda1fed2028a5f96575a84afc23aff7d"
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                {
                  "fixed": "6fbedf987b6b8ed54a50e2205d998eb2c8be72f9"
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                {
                  "fixed": "cb38e62922aa3991793344b5a5870e7291c74a44"
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                  "fixed": "c83b49383b595be50647f0c764a48c78b5f3c4f8"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54114.json"
          }
        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.14.0"
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                {
                  "fixed": "4.14.316"
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                  "introduced": "5.11.0"
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.30"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54114.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.620127296Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/02b20e0bc0c2628539e9e518dc342787c3332de2",
        "https://git.kernel.org/stable/c/2f88c8d38ecf5ed0273f99a067246899ba499eb2",
        "https://git.kernel.org/stable/c/435855b0831b351cb72cb38369ee33122ce9574c",
        "https://git.kernel.org/stable/c/6fbedf987b6b8ed54a50e2205d998eb2c8be72f9",
        "https://git.kernel.org/stable/c/c83b49383b595be50647f0c764a48c78b5f3c4f8",
        "https://git.kernel.org/stable/c/cb38e62922aa3991793344b5a5870e7291c74a44",
        "https://git.kernel.org/stable/c/cdd8160dcda1fed2028a5f96575a84afc23aff7d",
        "https://git.kernel.org/stable/c/d2309e0cb27b6871b273fbc1725e93be62570d86",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54114.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-54114",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54114.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-54114",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494400,
  "published_at": "2025-12-24T13:06:36.214+00:00"
}