CVE-2026-31428 (GCVE-0-2026-31428)
Vulnerability from cvelistv5
Published
2026-04-13 13:40
Modified
2026-05-11 22:08
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD __build_packet_message() manually constructs the NFULA_PAYLOAD netlink attribute using skb_put() and skb_copy_bits(), bypassing the standard nla_reserve()/nla_put() helpers. While nla_total_size(data_len) bytes are allocated (including NLA alignment padding), only data_len bytes of actual packet data are copied. The trailing nla_padlen(data_len) bytes (1-3 when data_len is not 4-byte aligned) are never initialized, leaking stale heap contents to userspace via the NFLOG netlink socket. Replace the manual attribute construction with nla_reserve(), which handles the tailroom check, header setup, and padding zeroing via __nla_reserve(). The subsequent skb_copy_bits() fills in the payload data on top of the properly initialized attribute.
References
Impacted products
Vendor Product Version
Linux Linux Version: df6fb868d6118686805c2fa566e213a8f31c8e4f
Version: df6fb868d6118686805c2fa566e213a8f31c8e4f
Version: df6fb868d6118686805c2fa566e213a8f31c8e4f
Version: df6fb868d6118686805c2fa566e213a8f31c8e4f
Version: df6fb868d6118686805c2fa566e213a8f31c8e4f
Version: df6fb868d6118686805c2fa566e213a8f31c8e4f
Version: df6fb868d6118686805c2fa566e213a8f31c8e4f
Version: df6fb868d6118686805c2fa566e213a8f31c8e4f
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          "programFiles": [
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:08:31.017Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7f3e5d72455936f42709116fabeca3bb216cda62"
        },
        {
          "url": "https://git.kernel.org/stable/c/21d8efda029948d3666b0db5afcc0d36c0984aae"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc961dd7272b5e4a462999635e44a4770d7f2482"
        },
        {
          "url": "https://git.kernel.org/stable/c/a8365d1064ded323797c5e28e91070c52f44b76c"
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        {
          "url": "https://git.kernel.org/stable/c/a2f6ff3444b663d6cfa63eadd61327a18592885a"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9f6c51d36482805ac3ffadb9663fe775a13e926"
        },
        {
          "url": "https://git.kernel.org/stable/c/7eff72968161fb8ddb26113344de3b92fb7d7ef5"
        },
        {
          "url": "https://git.kernel.org/stable/c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7"
        }
      ],
      "title": "netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD",
      "x_generator": {
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31428",
    "datePublished": "2026-04-13T13:40:30.987Z",
    "dateReserved": "2026-03-09T15:48:24.089Z",
    "dateUpdated": "2026-05-11T22:08:31.017Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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