Vulnerability-Lookup

CVE-2026-31428 (GCVE-0-2026-31428)

Vulnerability from cvelistv5 – Published: 2026-04-13 13:40 – Updated: 2026-04-13 13:40

Title

netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD

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.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/fc961dd7272b5e4a4…
	https://git.kernel.org/stable/c/a8365d1064ded3237…
	https://git.kernel.org/stable/c/a2f6ff3444b663d6c…
	https://git.kernel.org/stable/c/c9f6c51d36482805a…
	https://git.kernel.org/stable/c/7eff72968161fb8dd…
	https://git.kernel.org/stable/c/52025ebaa29f4eb4e…

Impacted products

Vendor

Product

Version

Linux

Affected: df6fb868d6118686805c2fa566e213a8f31c8e4f , < fc961dd7272b5e4a462999635e44a4770d7f2482 (git)
Affected: df6fb868d6118686805c2fa566e213a8f31c8e4f , < a8365d1064ded323797c5e28e91070c52f44b76c (git)
Affected: df6fb868d6118686805c2fa566e213a8f31c8e4f , < a2f6ff3444b663d6cfa63eadd61327a18592885a (git)
Affected: df6fb868d6118686805c2fa566e213a8f31c8e4f , < c9f6c51d36482805ac3ffadb9663fe775a13e926 (git)
Affected: df6fb868d6118686805c2fa566e213a8f31c8e4f , < 7eff72968161fb8ddb26113344de3b92fb7d7ef5 (git)
Affected: df6fb868d6118686805c2fa566e213a8f31c8e4f , < 52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7 (git)

Linux

Affected: 2.6.24
Unaffected: 0 , < 2.6.24 (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
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          "programFiles": [
            "net/netfilter/nfnetlink_log.c"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
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              "version": "6.18.21",
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              "version": "6.19.11",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
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          "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."
        }
      ],
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
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    "datePublished": "2026-04-13T13:40:30.987Z",
    "dateReserved": "2026-03-09T15:48:24.089Z",
    "dateUpdated": "2026-04-13T13:40:30.987Z",
    "state": "PUBLISHED"
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      "date": "2026-04-14",
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  }
}

FKIE_CVE-2026-31428

Vulnerability from fkie_nvd - Published: 2026-04-13 14:16 - Updated: 2026-04-13 15:01

Severity ?

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7eff72968161fb8ddb26113344de3b92fb7d7ef5
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a2f6ff3444b663d6cfa63eadd61327a18592885a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a8365d1064ded323797c5e28e91070c52f44b76c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c9f6c51d36482805ac3ffadb9663fe775a13e926
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fc961dd7272b5e4a462999635e44a4770d7f2482

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-31428",
  "lastModified": "2026-04-13T15:01:43.663",
  "metrics": {},
  "published": "2026-04-13T14:16:12.957",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7"
    },
    {
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      "url": "https://git.kernel.org/stable/c/7eff72968161fb8ddb26113344de3b92fb7d7ef5"
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      "url": "https://git.kernel.org/stable/c/a2f6ff3444b663d6cfa63eadd61327a18592885a"
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      "url": "https://git.kernel.org/stable/c/c9f6c51d36482805ac3ffadb9663fe775a13e926"
    },
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      "url": "https://git.kernel.org/stable/c/fc961dd7272b5e4a462999635e44a4770d7f2482"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

MSRC_CVE-2026-31428

Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-04-14 01:02

Summary

netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-31428

None Available There is no fix available for this vulnerability as of now

References

URL

Category

	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
	https://support.microsoft.com/lifecycle	external
	https://www.first.org/cvss	external
	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
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      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
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    },
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        "summary": "CVE-2026-31428 netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31428.json"
      },
      {
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      },
      {
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        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD",
    "tracking": {
      "current_release_date": "2026-04-14T01:02:38.000Z",
      "generator": {
        "date": "2026-04-14T07:04:14.552Z",
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      "initial_release_date": "2026-04-02T00:00:00.000Z",
      "revision_history": [
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          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
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      "status": "final",
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          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
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          {
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                "category": "product_version_range",
                "name": "azl3 kernel 6.6.130.1-3",
                "product": {
                  "name": "azl3 kernel 6.6.130.1-3",
                  "product_id": "1"
                }
              }
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          }
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        "category": "vendor",
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        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
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  "vulnerabilities": [
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      "notes": [
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        }
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      "product_status": {
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      "remediations": [
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          "date": "2026-04-14T01:02:38.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD"
    }
  ]
}

GHSA-MP33-36GG-V9H7

Vulnerability from github – Published: 2026-04-13 15:31 – Updated: 2026-04-13 15:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31428"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-13T14:16:12Z",
    "severity": null
  },
  "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": "GHSA-mp33-36gg-v9h7",
  "modified": "2026-04-13T15:31:42Z",
  "published": "2026-04-13T15:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31428"
    },
    {
      "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/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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date

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

CVE-2026-31428 (GCVE-0-2026-31428)

FKIE_CVE-2026-31428

MSRC_CVE-2026-31428

GHSA-MP33-36GG-V9H7

Tags

Sightings

Nomenclature