CVE-2025-40173 (GCVE-0-2025-40173)

Vulnerability from cvelistv5 – Published: 2025-11-12 10:53 – Updated: 2026-10-15 22:02
VLAI
Title
net/ip6_tunnel: Prevent perpetual tunnel growth
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:57 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < 566f8d5c8a443f2dd69c5460fdec43ed1c870c65 (git)
Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < 11f6066af3bfb8149aa16c42c0b0c5ea5b199a94 (git)
Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < 402b6985e872b4cf394bbbf33b503947a326a6cb (git)
Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < 10fe967efe73c610e526ff7460581610633dee9c (git)
Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < 48294a67863c9cfa367abb66bbf0ef6548ae124f (git)
Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < eeb4345488672584db4f8c20a1ae13a212ce31c4 (git)
Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < b6eb25d870f1a8ae571fd3da2244b71df547824b (git)
Affected: 8eb30be0352d09165e94a41fef1c7b994dca0714 , < 21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 5.4.301 , ≤ 5.4.* (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.196 , ≤ 5.15.* (semver)
Unaffected: 6.1.158 , ≤ 6.1.* (semver)
Unaffected: 6.6.114 , ≤ 6.6.* (semver)
Unaffected: 6.12.55 , ≤ 6.12.* (semver)
Unaffected: 6.17.5 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-40173",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:57:37.658529Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-15T22:02:39.584Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "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": [
            {
              "lessThan": "566f8d5c8a443f2dd69c5460fdec43ed1c870c65",
              "status": "affected",
              "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
              "versionType": "git"
            },
            {
              "lessThan": "11f6066af3bfb8149aa16c42c0b0c5ea5b199a94",
              "status": "affected",
              "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
              "versionType": "git"
            },
            {
              "lessThan": "402b6985e872b4cf394bbbf33b503947a326a6cb",
              "status": "affected",
              "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
              "versionType": "git"
            },
            {
              "lessThan": "10fe967efe73c610e526ff7460581610633dee9c",
              "status": "affected",
              "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
              "versionType": "git"
            },
            {
              "lessThan": "48294a67863c9cfa367abb66bbf0ef6548ae124f",
              "status": "affected",
              "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
              "versionType": "git"
            },
            {
              "lessThan": "eeb4345488672584db4f8c20a1ae13a212ce31c4",
              "status": "affected",
              "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
              "versionType": "git"
            },
            {
              "lessThan": "b6eb25d870f1a8ae571fd3da2244b71df547824b",
              "status": "affected",
              "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
              "versionType": "git"
            },
            {
              "lessThan": "21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16",
              "status": "affected",
              "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "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": [
            {
              "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.*",
              "status": "unaffected",
              "version": "6.12.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.301",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.246",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.196",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.158",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.114",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.55",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.5",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                }
              ],
              "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The unbounded growth is driven by the local transmit path (`ip6_tnl_xmit`) and requires the attacker to establish a two-tunnel routing loop and then push packets into it, which is done via netlink/socket operations on the local system. A purely remote attacker cannot create the required tunnel topology, so the reliable, fully attacker-controlled path is local.\nAC:L - The attacker controls every precondition \u2014 tunnel creation, the looping routes, and the packet stream \u2014 and each transmitted packet deterministically increments `dev-\u003eneeded_headroom` until the u16 header offset wraps; no race, memory-layout luck, or victim state is involved.\nPR:L - Configuring ip6tnl/ip6gre devices and routes needs CAP_NET_ADMIN, but an unprivileged user gains that in their own network namespace with `unshare -Urn`, and the resulting heap corruption is not confined to that namespace.\nUI:N - The attacker creates the tunnels and generates the traffic itself; no action by any other user or administrator is required.\nS:U - The corruption occurs in kernel memory within the same security authority; there is no VM, IOMMU, or hypervisor boundary crossed, making this standard in-kernel privilege escalation.\nC:H - Once `network_header` wraps, `skb-\u003edata` points outside `skb-\u003ehead`, producing out-of-bounds/use-after-free reads \u2014 the IPv4 twin of this bug was reported as a KASAN use-after-free read in `__skb_flow_dissect`, and such reads can disclose arbitrary adjacent kernel heap contents.\nI:H - After the negative `__skb_pull`, `dev_hard_header()` pushes and writes an L2 header at the out-of-bounds `skb-\u003edata`, giving an out-of-bounds write into unrelated kernel heap memory that can be leveraged for control-flow hijacking.\nA:H - The wrapped offsets and out-of-bounds accesses reliably produce kernel oops/panic, and the runaway headroom also forces ever-larger skb head reallocations, exhausting memory and destabilizing the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:08:18.915Z",
        "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"
        },
        {
          "url": "https://git.kernel.org/stable/c/eeb4345488672584db4f8c20a1ae13a212ce31c4"
        },
        {
          "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": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2026-10-15T22:02:39.584Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40173",
      "date": "2026-10-22",
      "epss": "0.00153",
      "percentile": "0.041"
    },
    "microsoft_vex": {
      "current_release_date": "2025-12-07T01:50:19.000Z",
      "cve": "CVE-2025-40173",
      "id": "msrc_CVE-2025-40173",
      "initial_release_date": "2025-11-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/ip6_tunnel: Prevent perpetual tunnel growth",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40173.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "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": [
                  {
                    "lessThan": "566f8d5c8a443f2dd69c5460fdec43ed1c870c65",
                    "status": "affected",
                    "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "11f6066af3bfb8149aa16c42c0b0c5ea5b199a94",
                    "status": "affected",
                    "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "402b6985e872b4cf394bbbf33b503947a326a6cb",
                    "status": "affected",
                    "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "10fe967efe73c610e526ff7460581610633dee9c",
                    "status": "affected",
                    "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "48294a67863c9cfa367abb66bbf0ef6548ae124f",
                    "status": "affected",
                    "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "eeb4345488672584db4f8c20a1ae13a212ce31c4",
                    "status": "affected",
                    "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "b6eb25d870f1a8ae571fd3da2244b71df547824b",
                    "status": "affected",
                    "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16",
                    "status": "affected",
                    "version": "8eb30be0352d09165e94a41fef1c7b994dca0714",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "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": [
                  {
                    "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.*",
                    "status": "unaffected",
                    "version": "6.12.55",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.17.*",
                    "status": "unaffected",
                    "version": "6.17.5",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.18",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/ip6_tunnel: Prevenir el crecimiento perpetuo del t\u00fanel\n\nDe manera similar al t\u00fanel ipv4, la versi\u00f3n ipv6 tambi\u00e9n actualiza dev-\u003eneeded_headroom.\nMientras que el crecimiento del ajuste del headroom del t\u00fanel ipv4 fue limitado en el commit 5ae1e9922bbd (\u201cnet: ip_tunnel: prevenir el crecimiento perpetuo del headroom\u201d), el t\u00fanel ipv6 a\u00fan aumenta el headroom sin ning\u00fan techo.\n\nReflejar el l\u00edmite de ajuste del headroom del t\u00fanel ipv4 en la versi\u00f3n ipv6.\n\nCr\u00e9ditos a Francesco Ruggeri, quien originalmente estaba depurando este problema y escribi\u00f3 un parche local espec\u00edfico de Arista y un reproductor."
          }
        ],
        "id": "CVE-2025-40173",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2025-40173",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:57:37.658529Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2025-11-12T11:15:47.780",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "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"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:47:47+00:00",
      "cve": "CVE-2025-40173",
      "id": "CVE-2025-40173",
      "initial_release_date": "2025-11-12T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/ip6_tunnel: Prevent perpetual tunnel growth",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40173.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.