Vulnerability-Lookup

CVE-2026-31692 (GCVE-0-2026-31692)

Vulnerability from cvelistv5 – Published: 2026-04-30 10:34 – Updated: 2026-04-30 10:34

Title

rtnetlink: add missing netlink_ns_capable() check for peer netns

Summary

In the Linux kernel, the following vulnerability has been resolved: rtnetlink: add missing netlink_ns_capable() check for peer netns rtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer network namespace when creating paired devices (veth, vxcan, netkit). This allows an unprivileged user with a user namespace to create interfaces in arbitrary network namespaces, including init_net. Add a netlink_ns_capable() check for CAP_NET_ADMIN in the peer namespace before allowing device creation to proceed.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/0975b64ffb3456004…
	https://git.kernel.org/stable/c/d04cc16d3624218a5…
	https://git.kernel.org/stable/c/7b735ef8128600779…

Impacted products

Vendor

Product

Version

Linux

Affected: 81adee47dfb608df3ad0b91d230fb3cef75f0060 , < 0975b64ffb34560042090a5986c3a02e6c80f36f (git)
Affected: 81adee47dfb608df3ad0b91d230fb3cef75f0060 , < d04cc16d3624218a5458b2b664ae431f1b3b334d (git)
Affected: 81adee47dfb608df3ad0b91d230fb3cef75f0060 , < 7b735ef81286007794a227ce2539419479c02a5f (git)

Linux

Affected: 2.6.33
Unaffected: 0 , < 2.6.33 (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/rtnetlink.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0975b64ffb34560042090a5986c3a02e6c80f36f",
              "status": "affected",
              "version": "81adee47dfb608df3ad0b91d230fb3cef75f0060",
              "versionType": "git"
            },
            {
              "lessThan": "d04cc16d3624218a5458b2b664ae431f1b3b334d",
              "status": "affected",
              "version": "81adee47dfb608df3ad0b91d230fb3cef75f0060",
              "versionType": "git"
            },
            {
              "lessThan": "7b735ef81286007794a227ce2539419479c02a5f",
              "status": "affected",
              "version": "81adee47dfb608df3ad0b91d230fb3cef75f0060",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/rtnetlink.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.33"
            },
            {
              "lessThan": "2.6.33",
              "status": "unaffected",
              "version": "0",
              "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": "6.18.24",
                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrtnetlink: add missing netlink_ns_capable() check for peer netns\n\nrtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer\nnetwork namespace when creating paired devices (veth, vxcan,\nnetkit). This allows an unprivileged user with a user namespace\nto create interfaces in arbitrary network namespaces, including\ninit_net.\n\nAdd a netlink_ns_capable() check for CAP_NET_ADMIN in the peer\nnamespace before allowing device creation to proceed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-30T10:34:51.589Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0975b64ffb34560042090a5986c3a02e6c80f36f"
        },
        {
          "url": "https://git.kernel.org/stable/c/d04cc16d3624218a5458b2b664ae431f1b3b334d"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b735ef81286007794a227ce2539419479c02a5f"
        }
      ],
      "title": "rtnetlink: add missing netlink_ns_capable() check for peer netns",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31692",
    "datePublished": "2026-04-30T10:34:51.589Z",
    "dateReserved": "2026-03-09T15:48:24.131Z",
    "dateUpdated": "2026-04-30T10:34:51.589Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31692",
      "date": "2026-05-04",
      "epss": "0.00023",
      "percentile": "0.06272"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31692\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-30T11:16:20.860\",\"lastModified\":\"2026-04-30T17:11:25.563\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nrtnetlink: add missing netlink_ns_capable() check for peer netns\\n\\nrtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer\\nnetwork namespace when creating paired devices (veth, vxcan,\\nnetkit). This allows an unprivileged user with a user namespace\\nto create interfaces in arbitrary network namespaces, including\\ninit_net.\\n\\nAdd a netlink_ns_capable() check for CAP_NET_ADMIN in the peer\\nnamespace before allowing device creation to proceed.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0975b64ffb34560042090a5986c3a02e6c80f36f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7b735ef81286007794a227ce2539419479c02a5f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d04cc16d3624218a5458b2b664ae431f1b3b334d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-31692

Vulnerability from fkie_nvd - Published: 2026-04-30 11:16 - Updated: 2026-04-30 17:11

Severity ?

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0975b64ffb34560042090a5986c3a02e6c80f36f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7b735ef81286007794a227ce2539419479c02a5f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d04cc16d3624218a5458b2b664ae431f1b3b334d

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrtnetlink: add missing netlink_ns_capable() check for peer netns\n\nrtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer\nnetwork namespace when creating paired devices (veth, vxcan,\nnetkit). This allows an unprivileged user with a user namespace\nto create interfaces in arbitrary network namespaces, including\ninit_net.\n\nAdd a netlink_ns_capable() check for CAP_NET_ADMIN in the peer\nnamespace before allowing device creation to proceed."
    }
  ],
  "id": "CVE-2026-31692",
  "lastModified": "2026-04-30T17:11:25.563",
  "metrics": {},
  "published": "2026-04-30T11:16:20.860",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0975b64ffb34560042090a5986c3a02e6c80f36f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7b735ef81286007794a227ce2539419479c02a5f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d04cc16d3624218a5458b2b664ae431f1b3b334d"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

MSRC_CVE-2026-31692

Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-05-01 01:02

Summary

rtnetlink: add missing netlink_ns_capable() check for peer netns

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-2026-31692

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": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-31692 rtnetlink: add missing netlink_ns_capable() check for peer netns - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31692.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "rtnetlink: add missing netlink_ns_capable() check for peer netns",
    "tracking": {
      "current_release_date": "2026-05-01T01:02:51.000Z",
      "generator": {
        "date": "2026-05-01T07:34:33.891Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-31692",
      "initial_release_date": "2026-04-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-01T01:02:51.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.134.1-2.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.134.1-2.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.134.1-2.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-31692",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-31692 rtnetlink: add missing netlink_ns_capable() check for peer netns - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31692.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-05-01T01:02:51.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "rtnetlink: add missing netlink_ns_capable() check for peer netns"
    }
  ]
}

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

CVE-2026-31692 (GCVE-0-2026-31692)

FKIE_CVE-2026-31692

MSRC_CVE-2026-31692

Tags

Sightings

Nomenclature