{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "48b1de4c110a7afa4b85862f6c75af817db26fad"
            },
            {
              "fixed": "2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4"
            },
            {
              "fixed": "5c9c67cf7a3d16051dfb90e98836f530964dfb8e"
            },
            {
              "fixed": "ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7"
            },
            {
              "fixed": "992c20bc8a4aba220c8b95b467d049289778dad6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.12.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80637.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: synproxy: fix unaligned memory access in timestamp adjustment\n\nUse get_unaligned_be32() and put_unaligned_be32() to safely read and\nwrite the timestamp fields. This prevents performance degradation due to\nunaligned memory access or even a crash on strict alignment\narchitectures.\n\nThis follows the implementation of timestamp parsing in the networking\nstack at tcp_parse_options() and synproxy_parse_options().",
  "id": "CVE-2026-80637",
  "modified": "2026-08-31T03:30:27.307116544Z",
  "published": "2026-08-28T06:48:50.836Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c9c67cf7a3d16051dfb90e98836f530964dfb8e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/992c20bc8a4aba220c8b95b467d049289778dad6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80637.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80637"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "netfilter: synproxy: fix unaligned memory access in timestamp adjustment"
}