CVE-2026-43085 (GCVE-0-2026-43085)
Vulnerability from cvelistv5
Published
2026-05-06 07:40
Modified
2026-06-01 16:14
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator When batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send() appends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via nlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put() helper only zeroes alignment padding after the payload, not the payload itself, so four bytes of stale kernel heap data are leaked to userspace in the NLMSG_DONE message body. Use nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes the nfgenmsg payload via nfnl_fill_hdr(), consistent with how __build_packet_message() already constructs NFULNL_MSG_PACKET headers.
References
Impacted products
Vendor Product Version
Linux Linux Version: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0
Version: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0
Version: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0
Version: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0
Version: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0
Version: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0
Version: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0
Version: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nfnetlink_log.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "5.15.209",
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            },
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.6.136",
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator\n\nWhen batching multiple NFLOG messages (inst-\u003eqlen \u003e 1), __nfulnl_send()\nappends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via\nnlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put()\nhelper only zeroes alignment padding after the payload, not the payload\nitself, so four bytes of stale kernel heap data are leaked to userspace\nin the NLMSG_DONE message body.\n\nUse nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes\nthe nfgenmsg payload via nfnl_fill_hdr(), consistent with how\n__build_packet_message() already constructs NFULNL_MSG_PACKET headers."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-01T16:14:26.215Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/296f18e1c3a87c915a92ed27832d5040a22d1072"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e2182865de781c41ab16b7985e9d26dcefea867"
        },
        {
          "url": "https://git.kernel.org/stable/c/57cc509d82b46150a11dcecc8b25eaa177eda34d"
        },
        {
          "url": "https://git.kernel.org/stable/c/368c22aea490f6f50df831b4f9e3623787686c5b"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1399632ba255d2e02c757af5d9f5d9279ce168c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d552bcfca323d175664d7444989b04f55666978a"
        },
        {
          "url": "https://git.kernel.org/stable/c/15d209bccf9273b4a8b4e579ba0e92d065b6ec8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4"
        }
      ],
      "title": "netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43085",
    "datePublished": "2026-05-06T07:40:19.915Z",
    "dateReserved": "2026-05-01T14:12:55.983Z",
    "dateUpdated": "2026-06-01T16:14:26.215Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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