{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e65650f291ee72fc578d6346080fc4699204ef2c"
            },
            {
              "fixed": "c6d5c582d55a8f229d75e98d62eaa065b0deb18d"
            },
            {
              "fixed": "227ec890559e922e235eb543646e3bf0bd8269b0"
            },
            {
              "fixed": "11d9be35c1f4233798e99be98bc474f83a254c6c"
            },
            {
              "fixed": "123f90f394ca404ab8796a7c8072ff7fa5b65a9c"
            },
            {
              "fixed": "36461e58f88a1b723f86693f437ac12e60ff4363"
            },
            {
              "fixed": "b5c0cff0c5331582ab01c4c423731453a8381acc"
            },
            {
              "fixed": "3c1e0a4bc156b8d5c5772dbc76b9ea74dce5ca24"
            },
            {
              "fixed": "70504de0bb627848667207bec7ccfd647deb8814"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.5.0"
            },
            {
              "fixed": "5.10.271"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.222"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.189"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.158"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.55"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98631.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: Use a 32-bit compare in xsk_map_gen_lookup\n\nxsk_map_gen_lookup() loads a u32 key and compares it with max_entries\nusing BPF_JMP_IMM. BPF immediates are sign-extended to 64 bits, so a\nmax_entries value of 0x80000000 or higher becomes a threshold larger\nthan every zero-extended 32-bit key. An out-of-range index then skips\nthe bounds check and the generated lookup reads past xsk_map[].\n\nCompare with BPF_JMP32_IMM so the check stays in 32-bit unsigned range.",
  "id": "CVE-2026-98631",
  "modified": "2026-10-20T02:31:02.920712060Z",
  "published": "2026-10-18T15:19:53.529Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11d9be35c1f4233798e99be98bc474f83a254c6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/123f90f394ca404ab8796a7c8072ff7fa5b65a9c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/227ec890559e922e235eb543646e3bf0bd8269b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36461e58f88a1b723f86693f437ac12e60ff4363"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c1e0a4bc156b8d5c5772dbc76b9ea74dce5ca24"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70504de0bb627848667207bec7ccfd647deb8814"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5c0cff0c5331582ab01c4c423731453a8381acc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c6d5c582d55a8f229d75e98d62eaa065b0deb18d"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98631.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98631"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "xsk: Use a 32-bit compare in xsk_map_gen_lookup"
}