CVE-2025-40173 (GCVE-0-2025-40173)
Vulnerability from cvelistv5
Published
2025-11-12 10:53
Modified
2025-11-12 10:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/ip6_tunnel: Prevent perpetual tunnel growth Similarly to ipv4 tunnel, ipv6 version updates dev->needed_headroom, too. While ipv4 tunnel headroom adjustment growth was limited in commit 5ae1e9922bbd ("net: ip_tunnel: prevent perpetual headroom growth"), ipv6 tunnel yet increases the headroom without any ceiling. Reflect ipv4 tunnel headroom adjustment limit on ipv6 version. Credits to Francesco Ruggeri, who was originally debugging this issue and wrote local Arista-specific patch and a reproducer.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8eb30be0352d09165e94a41fef1c7b994dca0714
Version: 8eb30be0352d09165e94a41fef1c7b994dca0714
Version: 8eb30be0352d09165e94a41fef1c7b994dca0714
Version: 8eb30be0352d09165e94a41fef1c7b994dca0714
Version: 8eb30be0352d09165e94a41fef1c7b994dca0714
Version: 8eb30be0352d09165e94a41fef1c7b994dca0714
Version: 8eb30be0352d09165e94a41fef1c7b994dca0714
Version: 8eb30be0352d09165e94a41fef1c7b994dca0714
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/ip_tunnels.h",
            "net/ipv4/ip_tunnel.c",
            "net/ipv6/ip6_tunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
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            "net/ipv4/ip_tunnel.c",
            "net/ipv6/ip6_tunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.7"
            },
            {
              "lessThan": "4.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.301",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.246",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.196",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
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              "version": "6.12.55",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ip6_tunnel: Prevent perpetual tunnel growth\n\nSimilarly to ipv4 tunnel, ipv6 version updates dev-\u003eneeded_headroom, too.\nWhile ipv4 tunnel headroom adjustment growth was limited in\ncommit 5ae1e9922bbd (\"net: ip_tunnel: prevent perpetual headroom growth\"),\nipv6 tunnel yet increases the headroom without any ceiling.\n\nReflect ipv4 tunnel headroom adjustment limit on ipv6 version.\n\nCredits to Francesco Ruggeri, who was originally debugging this issue\nand wrote local Arista-specific patch and a reproducer."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-11-12T10:53:49.571Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/566f8d5c8a443f2dd69c5460fdec43ed1c870c65"
        },
        {
          "url": "https://git.kernel.org/stable/c/11f6066af3bfb8149aa16c42c0b0c5ea5b199a94"
        },
        {
          "url": "https://git.kernel.org/stable/c/402b6985e872b4cf394bbbf33b503947a326a6cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/10fe967efe73c610e526ff7460581610633dee9c"
        },
        {
          "url": "https://git.kernel.org/stable/c/48294a67863c9cfa367abb66bbf0ef6548ae124f"
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        {
          "url": "https://git.kernel.org/stable/c/eeb4345488672584db4f8c20a1ae13a212ce31c4"
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        {
          "url": "https://git.kernel.org/stable/c/b6eb25d870f1a8ae571fd3da2244b71df547824b"
        },
        {
          "url": "https://git.kernel.org/stable/c/21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16"
        }
      ],
      "title": "net/ip6_tunnel: Prevent perpetual tunnel growth",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40173",
    "datePublished": "2025-11-12T10:53:49.571Z",
    "dateReserved": "2025-04-16T07:20:57.177Z",
    "dateUpdated": "2025-11-12T10:53:49.571Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40173\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-12T11:15:47.780\",\"lastModified\":\"2025-11-12T16:19:12.850\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/ip6_tunnel: Prevent perpetual tunnel growth\\n\\nSimilarly to ipv4 tunnel, ipv6 version updates dev-\u003eneeded_headroom, too.\\nWhile ipv4 tunnel headroom adjustment growth was limited in\\ncommit 5ae1e9922bbd (\\\"net: ip_tunnel: prevent perpetual headroom growth\\\"),\\nipv6 tunnel yet increases the headroom without any ceiling.\\n\\nReflect ipv4 tunnel headroom adjustment limit on ipv6 version.\\n\\nCredits to Francesco Ruggeri, who was originally debugging this issue\\nand wrote local Arista-specific patch and a reproducer.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/10fe967efe73c610e526ff7460581610633dee9c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/11f6066af3bfb8149aa16c42c0b0c5ea5b199a94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/402b6985e872b4cf394bbbf33b503947a326a6cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48294a67863c9cfa367abb66bbf0ef6548ae124f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/566f8d5c8a443f2dd69c5460fdec43ed1c870c65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6eb25d870f1a8ae571fd3da2244b71df547824b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eeb4345488672584db4f8c20a1ae13a212ce31c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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