{
  "cvss": 9.3,
  "datePublished": "2026-10-15T13:17:14.137",
  "dateUpdated": "2026-10-19T22:17:28.667",
  "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: validate checksum_start before completing checksum\n\nIf a packet with bad checksum metadata gets into the ipv4 stack,\nskb_checksum_help can corrupt the network header and cause a bunch of\nmischief.\n\nThis was discovered and reported by Paulos, and has been reporoduced\nby others independently since.\n\nWe really shouldn't allow such packets in, but as a defence\nin depth measure, let's also check before we complete the checksum.\n\nA more complete validation at input is forthcoming, but needs more work.",
  "id": "CVE-2026-99999",
  "raw": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "include/net/ip.h",
              "net/bridge/netfilter/nf_conntrack_bridge.c",
              "net/ipv4/ip_output.c",
              "net/netfilter/nfnetlink_queue.c",
              "net/netfilter/xt_CHECKSUM.c",
              "net/xfrm/xfrm_output.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "a464d950f31c89565cbaae038cc60db04fe01956",
                "status": "affected",
                "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
                "versionType": "git"
              },
              {
                "lessThan": "0fab003ef4698e0628060a45a48f14b43ba2a40a",
                "status": "affected",
                "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
                "versionType": "git"
              },
              {
                "lessThan": "94524b7b32691de2e2ce162c04d6cbc9106e5cbf",
                "status": "affected",
                "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
                "versionType": "git"
              },
              {
                "lessThan": "a65f69e0f38ffbed1b128029e09097436416dc8b",
                "status": "affected",
                "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
                "versionType": "git"
              },
              {
                "lessThan": "32a8b0adaa18e52aaa0b246b5ffe683075354dbb",
                "status": "affected",
                "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
                "versionType": "git"
              },
              {
                "lessThan": "f3e835af6226f1dd12160cbd696081e9b6155de0",
                "status": "affected",
                "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
                "versionType": "git"
              },
              {
                "lessThan": "c3e33464746166264334641dc850a36eef7e6326",
                "status": "affected",
                "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
                "versionType": "git"
              },
              {
                "lessThan": "6785011f8b16abf40b1e9d8b2e332232b3e68822",
                "status": "affected",
                "version": "f43798c27684ab925adde7d8acc34c78c6e50df8",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "include/net/ip.h",
              "net/bridge/netfilter/nf_conntrack_bridge.c",
              "net/ipv4/ip_output.c",
              "net/netfilter/nfnetlink_queue.c",
              "net/netfilter/xt_CHECKSUM.c",
              "net/xfrm/xfrm_output.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "2.6.27"
              },
              {
                "lessThan": "2.6.27",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.272",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.223",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.190",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.159",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.113",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.57",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.2.*",
                "status": "unaffected",
                "version": "7.2.11",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.3",
                "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\nipv4: validate checksum_start before completing checksum\n\nIf a packet with bad checksum metadata gets into the ipv4 stack,\nskb_checksum_help can corrupt the network header and cause a bunch of\nmischief.\n\nThis was discovered and reported by Paulos, and has been reporoduced\nby others independently since.\n\nWe really shouldn't allow such packets in, but as a defence\nin depth measure, let's also check before we complete the checksum.\n\nA more complete validation at input is forthcoming, but needs more work."
      }
    ],
    "id": "CVE-2026-99999",
    "lastModified": "2026-10-19T22:17:28.667",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.5,
          "impactScore": 6.0,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-99999",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-10-16T15:49:03.519458Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-10-15T13:17:14.137",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/0fab003ef4698e0628060a45a48f14b43ba2a40a"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/32a8b0adaa18e52aaa0b246b5ffe683075354dbb"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/6785011f8b16abf40b1e9d8b2e332232b3e68822"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/94524b7b32691de2e2ce162c04d6cbc9106e5cbf"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/a464d950f31c89565cbaae038cc60db04fe01956"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/a65f69e0f38ffbed1b128029e09097436416dc8b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/c3e33464746166264334641dc850a36eef7e6326"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/f3e835af6226f1dd12160cbd696081e9b6155de0"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://pwn.ai/blog/pwnescape"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://vercel.com/blog/findings-from-the-1-million-dollar-vercel-sandbox-challenge"
      },
      {
        "source": "af854a3a-2127-422b-91ae-364da2661108",
        "url": "http://www.openwall.com/lists/oss-security/2026/10/15/5"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Received",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-20"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "severity": "CRITICAL",
  "source": "nvd",
  "title": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: validate checksum_start before completing ..."
}