Vulnerability-Lookup

GHSA-XPXM-P6F4-J2MF

Vulnerability from github – Published: 2026-04-30 12:33 – Updated: 2026-04-30 12:33

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31692"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-30T11:16:20Z",
    "severity": null
  },
  "details": "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": "GHSA-xpxm-p6f4-j2mf",
  "modified": "2026-04-30T12:33:12Z",
  "published": "2026-04-30T12:33:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31692"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0975b64ffb34560042090a5986c3a02e6c80f36f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b735ef81286007794a227ce2539419479c02a5f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d04cc16d3624218a5458b2b664ae431f1b3b334d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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)

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{
  "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"
}

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-XPXM-P6F4-J2MF

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

Tags

Sightings

Nomenclature