Vulnerability-Lookup

GHSA-7X5H-H8J3-CRRP

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-23 15:32

Details

In the Linux kernel, the following vulnerability has been resolved:

net: ipip: require CAP_NET_ADMIN in the device netns for changelink

ipip_changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in t->net can rewrite a tunnel that lives in t->net.

Gate ipip_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72053"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:14Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipip: require CAP_NET_ADMIN in the device netns for changelink\n\nipip_changelink() operates on at most two netns, dev_net(dev) and the\ntunnel link netns t-\u003enet. They differ once the device is created in or\nmoved to a netns other than the one the request runs in. The rtnl\nchangelink path checks CAP_NET_ADMIN only against dev_net(dev), so a\ncaller privileged there but not in t-\u003enet can rewrite a tunnel that\nlives in t-\u003enet.\n\nGate ipip_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed.",
  "id": "GHSA-7x5h-h8j3-crrp",
  "modified": "2026-08-23T15:32:58Z",
  "published": "2026-08-15T06:32:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72053"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/068ad9b85f681755f751ebab82ae98146cec163d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26544021d5c49cc6ae8a968ccb5033e6363854a4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68cadc3698c7de88966d306d12ec9c6217da228a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8211a26324667980a463c069469a818e71207e02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91571643e554ae89a91942380d5f5361fb7060a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/983cc4aa7e6f633b34c3ee743771252d7afa9a90"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7d2642a50282322bc33f34ee7305f2b793df494"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d49edcc65e0a37cc9b386a94415c5d6670ca8b71"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72053 (GCVE-0-2026-72053)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-23 12:46

Title

net: ipip: require CAP_NET_ADMIN in the device netns for changelink

Summary

In the Linux kernel, the following vulnerability has been resolved: net: ipip: require CAP_NET_ADMIN in the device netns for changelink ipip_changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in t->net can rewrite a tunnel that lives in t->net. Gate ipip_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/a7d2642a50282322b…
https://git.kernel.org/stable/c/068ad9b85f681755f…
https://git.kernel.org/stable/c/91571643e554ae89a…
https://git.kernel.org/stable/c/983cc4aa7e6f633b3…
https://git.kernel.org/stable/c/26544021d5c49cc6a…
https://git.kernel.org/stable/c/68cadc3698c7de889…
https://git.kernel.org/stable/c/d49edcc65e0a37cc9…
https://git.kernel.org/stable/c/8211a26324667980a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee , < a7d2642a50282322bc33f34ee7305f2b793df494 (git) Affected: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee , < 068ad9b85f681755f751ebab82ae98146cec163d (git) Affected: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee , < 91571643e554ae89a91942380d5f5361fb7060a2 (git) Affected: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee , < 983cc4aa7e6f633b34c3ee743771252d7afa9a90 (git) Affected: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee , < 26544021d5c49cc6ae8a968ccb5033e6363854a4 (git) Affected: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee , < 68cadc3698c7de88966d306d12ec9c6217da228a (git) Affected: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee , < d49edcc65e0a37cc9b386a94415c5d6670ca8b71 (git) Affected: 6c742e714d8c282fd8f8b22d3e20b5141738c1ee , < 8211a26324667980a463c069469a818e71207e02 (git)
Linux	Linux	Affected: 3.12 Unaffected: 0 , < 3.12 (semver) Unaffected: 5.10.266 , ≤ 5.10.* (semver) Unaffected: 5.15.217 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ipip.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a7d2642a50282322bc33f34ee7305f2b793df494",
              "status": "affected",
              "version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
              "versionType": "git"
            },
            {
              "lessThan": "068ad9b85f681755f751ebab82ae98146cec163d",
              "status": "affected",
              "version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
              "versionType": "git"
            },
            {
              "lessThan": "91571643e554ae89a91942380d5f5361fb7060a2",
              "status": "affected",
              "version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
              "versionType": "git"
            },
            {
              "lessThan": "983cc4aa7e6f633b34c3ee743771252d7afa9a90",
              "status": "affected",
              "version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
              "versionType": "git"
            },
            {
              "lessThan": "26544021d5c49cc6ae8a968ccb5033e6363854a4",
              "status": "affected",
              "version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
              "versionType": "git"
            },
            {
              "lessThan": "68cadc3698c7de88966d306d12ec9c6217da228a",
              "status": "affected",
              "version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
              "versionType": "git"
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              "status": "affected",
              "version": "6c742e714d8c282fd8f8b22d3e20b5141738c1ee",
              "versionType": "git"
            }
          ]
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ipip.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.12"
            },
            {
              "lessThan": "3.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.266",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.266",
                  "versionStartIncluding": "3.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.217",
                  "versionStartIncluding": "3.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "3.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "3.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "3.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "3.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "3.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipip: require CAP_NET_ADMIN in the device netns for changelink\n\nipip_changelink() operates on at most two netns, dev_net(dev) and the\ntunnel link netns t-\u003enet. They differ once the device is created in or\nmoved to a netns other than the one the request runs in. The rtnl\nchangelink path checks CAP_NET_ADMIN only against dev_net(dev), so a\ncaller privileged there but not in t-\u003enet can rewrite a tunnel that\nlives in t-\u003enet.\n\nGate ipip_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires RTM_NEWLINK changelink over a local rtnetlink socket; ipip_changelink is only reachable from rtnl configuration, not from received IPv4/MPLS packets processed by ipip_rcv.\nAC:L - Once an IPIP device exists with t-\u003enet differing from dev_net(dev) via IFLA_LINK_NETNSID newlink or IFLA_NET_NS_FD migration, a single deterministic netlink changelink bypasses the missing check with no race or memory-layout dependency.\nPR:L - The rtnl entry path requires CAP_NET_ADMIN only in dev_net(dev), obtainable by an unprivileged local user via unshare --user --map-root-user --net; no CAP_NET_ADMIN in the sticky link netns t-\u003enet is required.\nUI:N - The attack is fully programmatic through netlink from the attacker\u0027s own process; no victim action such as mounting a filesystem, opening a file, or clicking is required.\nS:C - Authorization is checked against dev_net(dev) while ipip_changelink mutates tunnel state in t-\u003enet via ip_tunnel_changelink/ip_tunnel_update, crossing from the attacker\u0027s net/user namespace into another tenant\u0027s or the host\u0027s network namespace.\nC:H - An attacker can rewrite IFLA_IPTUN_LOCAL/REMOTE, link, fwmark, and encap parameters to redirect IPv4-in-IPv4/MPLS traffic to an attacker-controlled endpoint and read all tunneled payloads in the victim link netns.\nI:H - Unauthorized changelink updates live tunnel endpoints, underlay netdev, encap ports, and fwmark in t-\u003enet, enabling redirection and injection of encapsulated IPv4/MPLS traffic across the namespace boundary.\nA:H - Rewriting tunnel remote/local addresses, underlay device, or encap parameters breaks IPIP/MPLS overlay connectivity, causing sustained loss of service for every workload depending on the affected tunnel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:46:35.344Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/068ad9b85f681755f751ebab82ae98146cec163d"
        },
        {
          "url": "https://git.kernel.org/stable/c/91571643e554ae89a91942380d5f5361fb7060a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/983cc4aa7e6f633b34c3ee743771252d7afa9a90"
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        },
        {
          "url": "https://git.kernel.org/stable/c/68cadc3698c7de88966d306d12ec9c6217da228a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d49edcc65e0a37cc9b386a94415c5d6670ca8b71"
        },
        {
          "url": "https://git.kernel.org/stable/c/8211a26324667980a463c069469a818e71207e02"
        }
      ],
      "title": "net: ipip: require CAP_NET_ADMIN in the device netns for changelink",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72053",
    "datePublished": "2026-08-15T05:52:09.924Z",
    "dateReserved": "2026-08-09T03:40:39.902Z",
    "dateUpdated": "2026-08-23T12:46:35.344Z",
    "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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-7X5H-H8J3-CRRP

CVE-2026-72053 (GCVE-0-2026-72053)

Tags

Sightings

Nomenclature