Vulnerability-Lookup

GHSA-RP69-C9W2-RV4P

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-06 12:30

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43085"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T10:16:21Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-rp69-c9w2-rv4p",
  "modified": "2026-05-06T12:30:27Z",
  "published": "2026-05-06T12:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43085"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15d209bccf9273b4a8b4e579ba0e92d065b6ec8c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/368c22aea490f6f50df831b4f9e3623787686c5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1399632ba255d2e02c757af5d9f5d9279ce168c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d552bcfca323d175664d7444989b04f55666978a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-43085 (GCVE-0-2026-43085)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-11 22:17

Title

netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator

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.

Severity ?

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/368c22aea490f6f50…
https://git.kernel.org/stable/c/d1399632ba255d2e0…
https://git.kernel.org/stable/c/d552bcfca323d1756…
https://git.kernel.org/stable/c/15d209bccf9273b4a…
https://git.kernel.org/stable/c/1f3083aec8836213d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 , < 368c22aea490f6f50df831b4f9e3623787686c5b (git) Affected: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 , < d1399632ba255d2e02c757af5d9f5d9279ce168c (git) Affected: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 , < d552bcfca323d175664d7444989b04f55666978a (git) Affected: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 , < 15d209bccf9273b4a8b4e579ba0e92d065b6ec8c (git) Affected: 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 , < 1f3083aec8836213da441270cdb1ab612dd82cf4 (git)
Linux	Linux	Affected: 2.6.23 Unaffected: 0 , < 2.6.23 (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nfnetlink_log.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "368c22aea490f6f50df831b4f9e3623787686c5b",
              "status": "affected",
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              "versionType": "git"
            },
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              "versionType": "git"
            },
            {
              "lessThan": "d552bcfca323d175664d7444989b04f55666978a",
              "status": "affected",
              "version": "29c5d4afba51c71cfeadd3f74f3c42e064483fb0",
              "versionType": "git"
            },
            {
              "lessThan": "15d209bccf9273b4a8b4e579ba0e92d065b6ec8c",
              "status": "affected",
              "version": "29c5d4afba51c71cfeadd3f74f3c42e064483fb0",
              "versionType": "git"
            },
            {
              "lessThan": "1f3083aec8836213da441270cdb1ab612dd82cf4",
              "status": "affected",
              "version": "29c5d4afba51c71cfeadd3f74f3c42e064483fb0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nfnetlink_log.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.23"
            },
            {
              "lessThan": "2.6.23",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.136",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.136",
                  "versionStartIncluding": "2.6.23",
                  "vulnerable": true
                },
                {
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                {
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                {
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                {
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                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "2.6.23",
                  "vulnerable": true
                }
              ],
              "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": "2026-05-11T22:17:26.120Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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": "2026-05-11T22:17:26.120Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-RP69-C9W2-RV4P

CVE-2026-43085 (GCVE-0-2026-43085)

Tags

Sightings

Nomenclature