{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "df6fb868d6118686805c2fa566e213a8f31c8e4f"
            },
            {
              "fixed": "7f3e5d72455936f42709116fabeca3bb216cda62"
            },
            {
              "fixed": "21d8efda029948d3666b0db5afcc0d36c0984aae"
            },
            {
              "fixed": "fc961dd7272b5e4a462999635e44a4770d7f2482"
            },
            {
              "fixed": "a8365d1064ded323797c5e28e91070c52f44b76c"
            },
            {
              "fixed": "a2f6ff3444b663d6cfa63eadd61327a18592885a"
            },
            {
              "fixed": "c9f6c51d36482805ac3ffadb9663fe775a13e926"
            },
            {
              "fixed": "7eff72968161fb8ddb26113344de3b92fb7d7ef5"
            },
            {
              "fixed": "52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.24"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.131"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.80"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.21"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31428.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD\n\n__build_packet_message() manually constructs the NFULA_PAYLOAD netlink\nattribute using skb_put() and skb_copy_bits(), bypassing the standard\nnla_reserve()/nla_put() helpers. While nla_total_size(data_len) bytes\nare allocated (including NLA alignment padding), only data_len bytes\nof actual packet data are copied. The trailing nla_padlen(data_len)\nbytes (1-3 when data_len is not 4-byte aligned) are never initialized,\nleaking stale heap contents to userspace via the NFLOG netlink socket.\n\nReplace the manual attribute construction with nla_reserve(), which\nhandles the tailroom check, header setup, and padding zeroing via\n__nla_reserve(). The subsequent skb_copy_bits() fills in the payload\ndata on top of the properly initialized attribute.",
  "id": "CVE-2026-31428",
  "modified": "2026-07-08T05:38:53.241666680Z",
  "published": "2026-04-13T13:40:30.987Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21d8efda029948d3666b0db5afcc0d36c0984aae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7eff72968161fb8ddb26113344de3b92fb7d7ef5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f3e5d72455936f42709116fabeca3bb216cda62"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2f6ff3444b663d6cfa63eadd61327a18592885a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8365d1064ded323797c5e28e91070c52f44b76c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c9f6c51d36482805ac3ffadb9663fe775a13e926"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc961dd7272b5e4a462999635e44a4770d7f2482"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31428.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31428"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD"
}