{
  "advisories": [
    {
      "id": "USN-8593-1",
      "source": "usn",
      "title": "Linux kernel vulnerabilities",
      "url": "https://ubuntu.com/security/notices/USN-8593-1"
    },
    {
      "id": "USN-8603-1",
      "source": "usn",
      "title": "Linux kernel (Azure) vulnerabilities",
      "url": "https://ubuntu.com/security/notices/USN-8603-1"
    },
    {
      "id": "USN-8618-1",
      "source": "usn",
      "title": "Linux kernel vulnerabilities",
      "url": "https://ubuntu.com/security/notices/USN-8618-1"
    },
    {
      "id": "USN-8663-1",
      "source": "usn",
      "title": "Linux kernel (NVIDIA) vulnerabilities",
      "url": "https://ubuntu.com/security/notices/USN-8663-1"
    },
    {
      "id": "USN-8664-1",
      "source": "usn",
      "title": "Linux kernel (NVIDIA BaseOS) vulnerabilities",
      "url": "https://ubuntu.com/security/notices/USN-8664-1"
    },
    {
      "id": "USN-8728-1",
      "source": "usn",
      "title": "Linux kernel (GCP) vulnerabilities",
      "url": "https://ubuntu.com/security/notices/USN-8728-1"
    },
    {
      "id": "USN-8781-1",
      "source": "usn",
      "title": "Linux kernel (NVIDIA Tegra) vulnerabilities",
      "url": "https://ubuntu.com/security/notices/USN-8781-1"
    },
    {
      "id": "USN-8728-2",
      "source": "usn",
      "title": "Linux kernel (Azure) vulnerabilities",
      "url": "https://ubuntu.com/security/notices/USN-8728-2"
    },
    {
      "id": "USN-8817-1",
      "source": "usn",
      "title": "Linux kernel vulnerabilities",
      "url": "https://ubuntu.com/security/notices/USN-8817-1"
    },
    {
      "id": "USN-8818-1",
      "source": "usn",
      "title": "Linux kernel vulnerabilities",
      "url": "https://ubuntu.com/security/notices/USN-8818-1"
    },
    {
      "id": "USN-8818-2",
      "source": "usn",
      "title": "Linux kernel (IBM) vulnerabilities",
      "url": "https://ubuntu.com/security/notices/USN-8818-2"
    }
  ],
  "cve": "CVE-2026-63994",
  "enrichment": {
    "affected": [
      {
        "configurations": [
          {
            "platform": null,
            "status": "affected",
            "versions": {
              "scheme": "code_commit",
              "value": "[4cb47a8644cc9eb8ec81190a50e79e6530d0297f,95b6d772bfe788331d9742d73eaa12e113b2adc4)"
            }
          },
          {
            "platform": null,
            "status": "affected",
            "versions": {
              "scheme": "code_commit",
              "value": "[4cb47a8644cc9eb8ec81190a50e79e6530d0297f,7254aef4d1a7e18e887af9010e2f2dc34806789b)"
            }
          },
          {
            "platform": null,
            "status": "affected",
            "versions": {
              "scheme": "code_commit",
              "value": "[4cb47a8644cc9eb8ec81190a50e79e6530d0297f,bf8b3f34c37c162357138e7c0942723b8b94fed1)"
            }
          },
          {
            "platform": null,
            "status": "affected",
            "versions": {
              "scheme": "code_commit",
              "value": "[4cb47a8644cc9eb8ec81190a50e79e6530d0297f,76cd9398a0470257ab765bdf5f358a2af2e17934)"
            }
          },
          {
            "platform": null,
            "status": "affected",
            "versions": {
              "scheme": "code_commit",
              "value": "[4cb47a8644cc9eb8ec81190a50e79e6530d0297f,50750d86a2e5266aba0c295483b3397843198b11)"
            }
          },
          {
            "platform": null,
            "status": "affected",
            "versions": {
              "scheme": "code_commit",
              "value": "[4cb47a8644cc9eb8ec81190a50e79e6530d0297f,6dff77899b9e9fe5d854abda3a98ad04e7229ef7)"
            }
          },
          {
            "platform": null,
            "status": "affected",
            "versions": {
              "scheme": "code_commit",
              "value": "[4cb47a8644cc9eb8ec81190a50e79e6530d0297f,f3f204541f280a6ecb04503a0d6794d93990ca43)"
            }
          },
          {
            "platform": null,
            "status": "affected",
            "versions": {
              "scheme": "code_commit",
              "value": "[4cb47a8644cc9eb8ec81190a50e79e6530d0297f,b4bc94353050b1fa7b702bd4c6600710dd926cff)"
            }
          }
        ],
        "enrichment": {
          "confidence": 99.0,
          "confidence_source": "inferred",
          "scores": [
            {
              "score": 99.0,
              "source": "inferred"
            },
            {
              "score": 100.0,
              "source": "matching"
            }
          ]
        },
        "original": {
          "product": "Linux",
          "source": "cna",
          "vendor": "Linux"
        },
        "product": "linux_kernel",
        "vendor": "linux"
      },
      {
        "configurations": [
          {
            "platform": null,
            "status": "affected",
            "versions": {
              "scheme": "generic",
              "value": "5.9"
            }
          },
          {
            "platform": null,
            "status": "unaffected",
            "versions": {
              "scheme": "semver",
              "value": "[0,5.9)"
            }
          },
          {
            "platform": null,
            "status": "unaffected",
            "versions": {
              "scheme": "semver",
              "value": "[5.10.259,5.11.0)"
            }
          },
          {
            "platform": null,
            "status": "unaffected",
            "versions": {
              "scheme": "semver",
              "value": "[5.15.210,5.16.0)"
            }
          },
          {
            "platform": null,
            "status": "unaffected",
            "versions": {
              "scheme": "semver",
              "value": "[6.1.176,6.2.0)"
            }
          },
          {
            "platform": null,
            "status": "unaffected",
            "versions": {
              "scheme": "semver",
              "value": "[6.6.143,6.7.0)"
            }
          },
          {
            "platform": null,
            "status": "unaffected",
            "versions": {
              "scheme": "semver",
              "value": "[6.12.93,6.13.0)"
            }
          },
          {
            "platform": null,
            "status": "unaffected",
            "versions": {
              "scheme": "semver",
              "value": "[6.18.35,6.19.0)"
            }
          },
          {
            "platform": null,
            "status": "unaffected",
            "versions": {
              "scheme": "semver",
              "value": "[7.0.12,7.1.0)"
            }
          },
          {
            "platform": null,
            "status": "unaffected",
            "versions": {
              "scheme": "semver",
              "value": "[7.1,*]"
            }
          }
        ],
        "enrichment": {
          "confidence": 99.0,
          "confidence_source": "inferred",
          "scores": [
            {
              "score": 99.0,
              "source": "inferred"
            },
            {
              "score": 100.0,
              "source": "matching"
            }
          ]
        },
        "original": {
          "product": "Linux",
          "source": "cna",
          "vendor": "Linux"
        },
        "product": "linux_kernel",
        "vendor": "linux"
      }
    ],
    "created": "2026-07-21T06:45:02.909498+00:00",
    "updated": "2026-08-05T03:30:06.894826+00:00",
    "vendors": [
      "linux",
      "linux$PRODUCT$linux_kernel"
    ]
  },
  "epss": {
    "score": 0.00755
  },
  "mitre": {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"
    ],
    "created": "2026-07-19T14:56:13.896000+00:00",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\ntunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()\n\nSashiko found that iptunnel_pmtud_build_icmp() and\niptunnel_pmtud_build_icmpv6() were caching ip_hdr() and ipv6_hdr()\nbefore an skb_cow() call which can reallocate skb->head.\n\nFix this possible UAF by initializing the local variables\nafter the skb_cow() call.\n\nRemove skb_reset_network_header() calls which were not needed.",
    "metrics": {
      "cvssV2_0": {},
      "cvssV3_0": {},
      "cvssV3_1": {
        "score": 9.8,
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
      },
      "cvssV4_0": {}
    },
    "mitre_repo_path": "cves/2026/63xxx/CVE-2026-63994.json",
    "references": [
      "https://git.kernel.org/stable/c/50750d86a2e5266aba0c295483b3397843198b11",
      "https://git.kernel.org/stable/c/6dff77899b9e9fe5d854abda3a98ad04e7229ef7",
      "https://git.kernel.org/stable/c/7254aef4d1a7e18e887af9010e2f2dc34806789b",
      "https://git.kernel.org/stable/c/76cd9398a0470257ab765bdf5f358a2af2e17934",
      "https://git.kernel.org/stable/c/95b6d772bfe788331d9742d73eaa12e113b2adc4",
      "https://git.kernel.org/stable/c/b4bc94353050b1fa7b702bd4c6600710dd926cff",
      "https://git.kernel.org/stable/c/bf8b3f34c37c162357138e7c0942723b8b94fed1",
      "https://git.kernel.org/stable/c/f3f204541f280a6ecb04503a0d6794d93990ca43"
    ],
    "title": "tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()",
    "updated": "2026-08-05T12:37:58.389000+00:00",
    "vendors": [
      "linux",
      "linux$PRODUCT$linux_kernel"
    ],
    "weaknesses": []
  },
  "nvd": {
    "cpes": [],
    "created": "2026-07-19T16:17:38.943000+00:00",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\ntunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()\n\nSashiko found that iptunnel_pmtud_build_icmp() and\niptunnel_pmtud_build_icmpv6() were caching ip_hdr() and ipv6_hdr()\nbefore an skb_cow() call which can reallocate skb->head.\n\nFix this possible UAF by initializing the local variables\nafter the skb_cow() call.\n\nRemove skb_reset_network_header() calls which were not needed.",
    "metrics": {
      "cvssV2_0": {},
      "cvssV3_0": {},
      "cvssV3_1": {
        "score": 9.8,
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
      },
      "cvssV4_0": {}
    },
    "nvd_repo_path": "2026/CVE-2026-63994.json",
    "references": [
      "https://git.kernel.org/stable/c/50750d86a2e5266aba0c295483b3397843198b11",
      "https://git.kernel.org/stable/c/6dff77899b9e9fe5d854abda3a98ad04e7229ef7",
      "https://git.kernel.org/stable/c/7254aef4d1a7e18e887af9010e2f2dc34806789b",
      "https://git.kernel.org/stable/c/76cd9398a0470257ab765bdf5f358a2af2e17934",
      "https://git.kernel.org/stable/c/95b6d772bfe788331d9742d73eaa12e113b2adc4",
      "https://git.kernel.org/stable/c/b4bc94353050b1fa7b702bd4c6600710dd926cff",
      "https://git.kernel.org/stable/c/bf8b3f34c37c162357138e7c0942723b8b94fed1",
      "https://git.kernel.org/stable/c/f3f204541f280a6ecb04503a0d6794d93990ca43"
    ],
    "title": null,
    "updated": "2026-07-30T14:51:11.223000+00:00",
    "vendors": [],
    "weaknesses": []
  },
  "opencve": {
    "changes": [
      {
        "created": "2026-07-19T15:30:00+00:00",
        "data": [
          {
            "details": {
              "new": "In the Linux kernel, the following vulnerability has been resolved:\n\ntunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()\n\nSashiko found that iptunnel_pmtud_build_icmp() and\niptunnel_pmtud_build_icmpv6() were caching ip_hdr() and ipv6_hdr()\nbefore an skb_cow() call which can reallocate skb->head.\n\nFix this possible UAF by initializing the local variables\nafter the skb_cow() call.\n\nRemove skb_reset_network_header() calls which were not needed.",
              "old": null
            },
            "type": "description"
          },
          {
            "details": {
              "new": "tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()",
              "old": null
            },
            "type": "title"
          },
          {
            "details": [
              "linux",
              "linux$PRODUCT$linux_kernel"
            ],
            "type": "first_time"
          },
          {
            "details": {
              "added": [
                "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"
              ],
              "removed": []
            },
            "type": "cpes"
          },
          {
            "details": {
              "added": [
                "linux",
                "linux$PRODUCT$linux_kernel"
              ],
              "removed": []
            },
            "type": "vendors"
          },
          {
            "details": {
              "added": [
                "https://git.kernel.org/stable/c/50750d86a2e5266aba0c295483b3397843198b11",
                "https://git.kernel.org/stable/c/6dff77899b9e9fe5d854abda3a98ad04e7229ef7",
                "https://git.kernel.org/stable/c/7254aef4d1a7e18e887af9010e2f2dc34806789b",
                "https://git.kernel.org/stable/c/76cd9398a0470257ab765bdf5f358a2af2e17934",
                "https://git.kernel.org/stable/c/95b6d772bfe788331d9742d73eaa12e113b2adc4",
                "https://git.kernel.org/stable/c/b4bc94353050b1fa7b702bd4c6600710dd926cff",
                "https://git.kernel.org/stable/c/bf8b3f34c37c162357138e7c0942723b8b94fed1",
                "https://git.kernel.org/stable/c/f3f204541f280a6ecb04503a0d6794d93990ca43"
              ],
              "removed": []
            },
            "type": "references"
          }
        ],
        "id": "8ebea3e0-003b-4ac9-bfd6-4c6f375853a3"
      },
      {
        "created": "2026-07-20T14:45:00+00:00",
        "data": [
          {
            "details": {
              "added": {
                "cvssV3_1": {
                  "score": 9.8,
                  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
                }
              },
              "removed": {},
              "updated": {}
            },
            "type": "metrics"
          }
        ],
        "id": "e4ae0a50-9fab-4f50-b6d6-3940e65df071"
      },
      {
        "created": "2026-07-22T00:15:00+00:00",
        "data": [
          {
            "details": {
              "added": [
                "CWE-825"
              ],
              "removed": []
            },
            "type": "weaknesses"
          },
          {
            "details": {
              "added": [
                "https://lore.kernel.org/linux-cve-announce/2026071905-CVE-2026-63994-97bf@gregkh/T",
                "https://nvd.nist.gov/vuln/detail/CVE-2026-63994",
                "https://www.cve.org/CVERecord?id=CVE-2026-63994"
              ],
              "removed": []
            },
            "type": "references"
          },
          {
            "details": {
              "added": {},
              "removed": {},
              "updated": {
                "threat_severity": {
                  "new": "Important",
                  "old": null
                }
              }
            },
            "type": "metrics"
          }
        ],
        "id": "0f539da9-0f7a-43bd-8fb6-617bc2bd3215"
      }
    ],
    "cpes": {
      "data": [
        "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"
      ],
      "providers": [
        "mitre"
      ]
    },
    "created": {
      "data": "2026-07-19T00:00:00+00:00",
      "provider": "redhat"
    },
    "description": {
      "data": "In the Linux kernel, the following vulnerability has been resolved:\n\ntunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()\n\nSashiko found that iptunnel_pmtud_build_icmp() and\niptunnel_pmtud_build_icmpv6() were caching ip_hdr() and ipv6_hdr()\nbefore an skb_cow() call which can reallocate skb->head.\n\nFix this possible UAF by initializing the local variables\nafter the skb_cow() call.\n\nRemove skb_reset_network_header() calls which were not needed.",
      "provider": "mitre"
    },
    "metrics": {
      "cvssV2_0": {
        "data": {},
        "provider": null
      },
      "cvssV3_0": {
        "data": {},
        "provider": null
      },
      "cvssV3_1": {
        "data": {
          "score": 9.8,
          "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        },
        "provider": "mitre"
      },
      "cvssV4_0": {
        "data": {},
        "provider": null
      },
      "epss": {
        "data": {
          "score": 0.00755
        },
        "provider": "first"
      },
      "kev": {
        "data": {},
        "provider": null
      },
      "ssvc": {
        "data": {},
        "provider": null
      },
      "threat_severity": {
        "data": "Important",
        "provider": "redhat"
      }
    },
    "references": {
      "data": [
        "https://git.kernel.org/stable/c/50750d86a2e5266aba0c295483b3397843198b11",
        "https://git.kernel.org/stable/c/6dff77899b9e9fe5d854abda3a98ad04e7229ef7",
        "https://git.kernel.org/stable/c/7254aef4d1a7e18e887af9010e2f2dc34806789b",
        "https://git.kernel.org/stable/c/76cd9398a0470257ab765bdf5f358a2af2e17934",
        "https://git.kernel.org/stable/c/95b6d772bfe788331d9742d73eaa12e113b2adc4",
        "https://git.kernel.org/stable/c/b4bc94353050b1fa7b702bd4c6600710dd926cff",
        "https://git.kernel.org/stable/c/bf8b3f34c37c162357138e7c0942723b8b94fed1",
        "https://git.kernel.org/stable/c/f3f204541f280a6ecb04503a0d6794d93990ca43",
        "https://lore.kernel.org/linux-cve-announce/2026071905-CVE-2026-63994-97bf@gregkh/T",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63994",
        "https://www.cve.org/CVERecord?id=CVE-2026-63994"
      ],
      "providers": [
        "mitre",
        "nvd",
        "redhat"
      ]
    },
    "title": {
      "data": "tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()",
      "provider": "mitre"
    },
    "updated": {
      "data": "2026-07-21T06:45:02.909540+00:00",
      "provider": "enrichment"
    },
    "vendors": {
      "data": [
        "linux",
        "linux$PRODUCT$linux_kernel"
      ],
      "providers": [
        "mitre",
        "enrichment"
      ]
    },
    "weaknesses": {
      "data": [
        "CWE-825"
      ],
      "providers": [
        "redhat"
      ]
    }
  },
  "redhat": {
    "cpes": [],
    "created": "2026-07-19T00:00:00+00:00",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\ntunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()\nSashiko found that iptunnel_pmtud_build_icmp() and\niptunnel_pmtud_build_icmpv6() were caching ip_hdr() and ipv6_hdr()\nbefore an skb_cow() call which can reallocate skb->head.\nFix this possible UAF by initializing the local variables\nafter the skb_cow() call.\nRemove skb_reset_network_header() calls which were not needed.",
    "metrics": {
      "cvssV2_0": {},
      "cvssV3_0": {},
      "cvssV3_1": {
        "score": 7.0,
        "vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
      },
      "threat_severity": "Important"
    },
    "redhat_repo_path": "2026/CVE-2026-63994.json",
    "references": [
      "https://lore.kernel.org/linux-cve-announce/2026071905-CVE-2026-63994-97bf@gregkh/T",
      "https://nvd.nist.gov/vuln/detail/CVE-2026-63994",
      "https://www.cve.org/CVERecord?id=CVE-2026-63994"
    ],
    "title": "kernel: tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()",
    "updated": "2026-07-19T00:00:00+00:00",
    "vendors": [],
    "weaknesses": [
      "CWE-825"
    ]
  }
}