{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9"
            },
            {
              "fixed": "46d21495f633e38d40857401504ee51c56ffed2a"
            },
            {
              "fixed": "6267f8304cbd9ec9f3f53bd227a733e07131492e"
            },
            {
              "fixed": "99c59062172620a0bac4ae8cf37c83bb78772cdd"
            },
            {
              "fixed": "c44c02c930c6583b235a1937c69ff716c4bb4514"
            },
            {
              "fixed": "3fb5ad2951a6df92c98f4f06cd70f20c50a2eb2a"
            },
            {
              "fixed": "cc18eb0e9941162c03f03f411ed7f6c339d91fa0"
            },
            {
              "fixed": "61b43a51a55929ec040bee3ea51af2121b956d05"
            },
            {
              "fixed": "f202578efc738b883cfa04889eb97328914265a7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.20.0"
            },
            {
              "fixed": "5.10.273"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.224"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.191"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.160"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.113"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.57"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98950.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nflow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()\n\nbpf_flow_dissect() sanitizes the offsets returned by the BPF program\nwith clamp_t(u16, ..., hlen).\n\nIf hlen is bigger than 65535, the upper bound is truncated before\nthe comparison. For instance, with hlen == 65536, both nhoff and\nthoff are forced to zero, even if the program returned sane values.\n\nThis is the same class of bug as the one fixed in commit 99bda1ecbd56\n(\"flow_dissector: avoid u16 truncation of skb-\u003elen when computing\nthoff\"). That fix does not cover the BPF path, because\n__skb_flow_dissect() returns early when a BPF flow dissector\nhandles the packet.\n\nstruct bpf_flow_keys stores nhoff and thoff as u16, so cap hlen\nto U16_MAX before clamping.\n\nFound by sashiko while reviewing the commit above.",
  "id": "CVE-2026-98950",
  "modified": "2026-11-01T02:31:00.291966812Z",
  "published": "2026-10-23T12:19:09.890Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3fb5ad2951a6df92c98f4f06cd70f20c50a2eb2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46d21495f633e38d40857401504ee51c56ffed2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/61b43a51a55929ec040bee3ea51af2121b956d05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6267f8304cbd9ec9f3f53bd227a733e07131492e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/99c59062172620a0bac4ae8cf37c83bb78772cdd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c44c02c930c6583b235a1937c69ff716c4bb4514"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc18eb0e9941162c03f03f411ed7f6c339d91fa0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f202578efc738b883cfa04889eb97328914265a7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98950.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98950"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.2",
  "summary": "flow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()"
}