{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ip_gre.c",
            "net/ipv6/ip6_gre.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b282b2a9eed848587c1348abdd5d83fa346a2743",
              "status": "affected",
              "version": "bb5e62f2d547c4de6d1b144cbce2373a76c33f18",
              "versionType": "git"
            },
            {
              "lessThan": "35ddf66c65eff93fff91406756ba273600bf61a3",
              "status": "affected",
              "version": "bb5e62f2d547c4de6d1b144cbce2373a76c33f18",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ip_gre.c",
            "net/ipv6/ip6_gre.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.4",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19-rc4",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerspan: Initialize options_len before referencing options.\n\nThe struct ip_tunnel_info has a flexible array member named\noptions that is protected by a counted_by(options_len)\nattribute.\n\nThe compiler will use this information to enforce runtime bounds\nchecking deployed by FORTIFY_SOURCE string helpers.\n\nAs laid out in the GCC documentation, the counter must be\ninitialized before the first reference to the flexible array\nmember.\n\nAfter scanning through the files that use struct ip_tunnel_info\nand also refer to options or options_len, it appears the normal\ncase is to use the ip_tunnel_info_opts_set() helper.\n\nSaid helper would initialize options_len properly before copying\ndata into options, however in the GRE ERSPAN code a partial\nupdate is done, preventing the use of the helper function.\n\nBefore this change the handling of ERSPAN traffic in GRE tunnels\nwould cause a kernel panic when the kernel is compiled with\nGCC 15+ and having FORTIFY_SOURCE configured:\n\nmemcpy: detected buffer overflow: 4 byte write of buffer size 0\n\nCall Trace:\n \u003cIRQ\u003e\n __fortify_panic+0xd/0xf\n erspan_rcv.cold+0x68/0x83\n ? ip_route_input_slow+0x816/0x9d0\n gre_rcv+0x1b2/0x1c0\n gre_rcv+0x8e/0x100\n ? raw_v4_input+0x2a0/0x2b0\n ip_protocol_deliver_rcu+0x1ea/0x210\n ip_local_deliver_finish+0x86/0x110\n ip_local_deliver+0x65/0x110\n ? ip_rcv_finish_core+0xd6/0x360\n ip_rcv+0x186/0x1a0\n\nReported-at: https://launchpad.net/bugs/2129580"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-14T15:07:44.941Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b282b2a9eed848587c1348abdd5d83fa346a2743"
        },
        {
          "url": "https://git.kernel.org/stable/c/35ddf66c65eff93fff91406756ba273600bf61a3"
        }
      ],
      "title": "erspan: Initialize options_len before referencing options.",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71128",
    "datePublished": "2026-01-14T15:07:44.941Z",
    "dateReserved": "2026-01-13T15:30:19.655Z",
    "dateUpdated": "2026-01-14T15:07:44.941Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-71128\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-14T15:16:02.547\",\"lastModified\":\"2026-01-14T16:25:12.057\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nerspan: Initialize options_len before referencing options.\\n\\nThe struct ip_tunnel_info has a flexible array member named\\noptions that is protected by a counted_by(options_len)\\nattribute.\\n\\nThe compiler will use this information to enforce runtime bounds\\nchecking deployed by FORTIFY_SOURCE string helpers.\\n\\nAs laid out in the GCC documentation, the counter must be\\ninitialized before the first reference to the flexible array\\nmember.\\n\\nAfter scanning through the files that use struct ip_tunnel_info\\nand also refer to options or options_len, it appears the normal\\ncase is to use the ip_tunnel_info_opts_set() helper.\\n\\nSaid helper would initialize options_len properly before copying\\ndata into options, however in the GRE ERSPAN code a partial\\nupdate is done, preventing the use of the helper function.\\n\\nBefore this change the handling of ERSPAN traffic in GRE tunnels\\nwould cause a kernel panic when the kernel is compiled with\\nGCC 15+ and having FORTIFY_SOURCE configured:\\n\\nmemcpy: detected buffer overflow: 4 byte write of buffer size 0\\n\\nCall Trace:\\n \u003cIRQ\u003e\\n __fortify_panic+0xd/0xf\\n erspan_rcv.cold+0x68/0x83\\n ? ip_route_input_slow+0x816/0x9d0\\n gre_rcv+0x1b2/0x1c0\\n gre_rcv+0x8e/0x100\\n ? raw_v4_input+0x2a0/0x2b0\\n ip_protocol_deliver_rcu+0x1ea/0x210\\n ip_local_deliver_finish+0x86/0x110\\n ip_local_deliver+0x65/0x110\\n ? ip_rcv_finish_core+0xd6/0x360\\n ip_rcv+0x186/0x1a0\\n\\nReported-at: https://launchpad.net/bugs/2129580\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/35ddf66c65eff93fff91406756ba273600bf61a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b282b2a9eed848587c1348abdd5d83fa346a2743\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}