Vulnerability-Lookup

CVE-2026-31414 (GCVE-0-2026-31414)

Vulnerability from cvelistv5 – Published: 2026-04-13 13:21 – Updated: 2026-04-13 13:21

Title

netfilter: nf_conntrack_expect: use expect->helper

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: use expect->helper Use expect->helper in ctnetlink and /proc to dump the helper name. Using nfct_help() without holding a reference to the master conntrack is unsafe. Use exp->master->helper in ctnetlink path if userspace does not provide an explicit helper when creating an expectation to retain the existing behaviour. The ctnetlink expectation path holds the reference on the master conntrack and nf_conntrack_expect lock and the nfnetlink glue path refers to the master ct that is attached to the skb.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/847cb7fe26c5ce5dc…
	https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be…
	https://git.kernel.org/stable/c/4bd1b3d839172724b…
	https://git.kernel.org/stable/c/b53294bff19e56ada…
	https://git.kernel.org/stable/c/3dfd3f7712b5a800f…
	https://git.kernel.org/stable/c/f01794106042ee27e…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e7ccaa0a62a8ff2be5d521299ce79390c318d306 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4bd1b3d839172724b33d8d02c5a4ff6a1c775417 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b53294bff19e56ada2f230ceb8b1ffde61cc3817 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3dfd3f7712b5a800f2ba632179e9b738076a51f0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f01794106042ee27e54af6fdf5b319a2fe3df94d (git)

Linux

Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 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/nf_conntrack_expect.c",
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            "net/netfilter/nf_conntrack_netlink.c",
            "net/netfilter/nf_conntrack_sip.c"
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            "net/netfilter/nf_conntrack_netlink.c",
            "net/netfilter/nf_conntrack_sip.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "semver"
            },
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
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              "versionType": "semver"
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        }
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      "providerMetadata": {
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    "datePublished": "2026-04-13T13:21:02.592Z",
    "dateReserved": "2026-03-09T15:48:24.087Z",
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}

FKIE_CVE-2026-31414

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/3dfd3f7712b5a800f2ba632179e9b738076a51f0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d

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: nf_conntrack_expect: use expect-\u003ehelper\n\nUse expect-\u003ehelper in ctnetlink and /proc to dump the helper name.\nUsing nfct_help() without holding a reference to the master conntrack\nis unsafe.\n\nUse exp-\u003emaster-\u003ehelper in ctnetlink path if userspace does not provide\nan explicit helper when creating an expectation to retain the existing\nbehaviour. The ctnetlink expectation path holds the reference on the\nmaster conntrack and nf_conntrack_expect lock and the nfnetlink glue\npath refers to the master ct that is attached to the skb."
    }
  ],
  "id": "CVE-2026-31414",
  "lastModified": "2026-04-13T15:01:43.663",
  "metrics": {},
  "published": "2026-04-13T14:16:10.537",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306"
    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

GHSA-79R8-QX2R-F755

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: nf_conntrack_expect: use expect->helper

Use expect->helper in ctnetlink and /proc to dump the helper name. Using nfct_help() without holding a reference to the master conntrack is unsafe.

Use exp->master->helper in ctnetlink path if userspace does not provide an explicit helper when creating an expectation to retain the existing behaviour. The ctnetlink expectation path holds the reference on the master conntrack and nf_conntrack_expect lock and the nfnetlink glue path refers to the master ct that is attached to the skb.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-31414"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-13T14:16:10Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_expect: use expect-\u003ehelper\n\nUse expect-\u003ehelper in ctnetlink and /proc to dump the helper name.\nUsing nfct_help() without holding a reference to the master conntrack\nis unsafe.\n\nUse exp-\u003emaster-\u003ehelper in ctnetlink path if userspace does not provide\nan explicit helper when creating an expectation to retain the existing\nbehaviour. The ctnetlink expectation path holds the reference on the\nmaster conntrack and nf_conntrack_expect lock and the nfnetlink glue\npath refers to the master ct that is attached to the skb.",
  "id": "GHSA-79r8-qx2r-f755",
  "modified": "2026-04-13T15:31:42Z",
  "published": "2026-04-13T15:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31414"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3dfd3f7712b5a800f2ba632179e9b738076a51f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bd1b3d839172724b33d8d02c5a4ff6a1c775417"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b53294bff19e56ada2f230ceb8b1ffde61cc3817"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7ccaa0a62a8ff2be5d521299ce79390c318d306"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f01794106042ee27e54af6fdf5b319a2fe3df94d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

MSRC_CVE-2026-31414

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

Summary

netfilter: nf_conntrack_expect: use expect->helper

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-2026-31414

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/"
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    "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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        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31414.json"
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    "title": "netfilter: nf_conntrack_expect: use expect-\u003ehelper",
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            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 6.6.130.1-3",
                "product": {
                  "name": "azl3 kernel 6.6.130.1-3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 6.6.130.1-3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-31414",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-31414 netfilter: nf_conntrack_expect: use expect-\u003ehelper - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31414.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-04-14T01:02:05.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "netfilter: nf_conntrack_expect: use expect-\u003ehelper"
    }
  ]
}

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-2026-31414 (GCVE-0-2026-31414)

FKIE_CVE-2026-31414

GHSA-79R8-QX2R-F755

MSRC_CVE-2026-31414

Tags

Sightings

Nomenclature