Vulnerability-Lookup

GHSA-R26Q-49RH-GWM8

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

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

vti_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 vti_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-2026-72054"
  ],
  "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: ip_vti: require CAP_NET_ADMIN in the device netns for changelink\n\nvti_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 vti_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed.",
  "id": "GHSA-r26q-49rh-gwm8",
  "modified": "2026-08-17T06:33:06Z",
  "published": "2026-08-15T06:32:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72054"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1caf737e625143c6f23c32d2b747b1a3e42e5699"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/32edf8aa297745226854eda2d96c0fac66c1bb15"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/33fd93961557ec8e3e9958995b28684c5f949394"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d8bc0dc99472d62c57c2a3d436e6ab408592bda"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88b33ee458a6ca5fbef6c53b9dba772da69dab68"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9571af2eec8023af9a1671b7f2cd4ab400011724"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95cceadbfd52d7239bd730afdda0655287d77425"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/973ead9e565423642e4533e1547b5d2c0476fb03"
    }
  ],
  "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-2026-72054 (GCVE-0-2026-72054)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-17 05:39

Title

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

Summary

In the Linux kernel, the following vulnerability has been resolved: net: ip_vti: require CAP_NET_ADMIN in the device netns for changelink vti_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 vti_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/1caf737e625143c6f…
https://git.kernel.org/stable/c/32edf8aa297745226…
https://git.kernel.org/stable/c/973ead9e565423642…
https://git.kernel.org/stable/c/33fd93961557ec8e3…
https://git.kernel.org/stable/c/6d8bc0dc99472d62c…
https://git.kernel.org/stable/c/9571af2eec8023af9…
https://git.kernel.org/stable/c/88b33ee458a6ca5fb…
https://git.kernel.org/stable/c/95cceadbfd52d7239…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 895de9a3488abcdd186680f0af3cce7f2d4d4a6e , < 1caf737e625143c6f23c32d2b747b1a3e42e5699 (git) Affected: 895de9a3488abcdd186680f0af3cce7f2d4d4a6e , < 32edf8aa297745226854eda2d96c0fac66c1bb15 (git) Affected: 895de9a3488abcdd186680f0af3cce7f2d4d4a6e , < 973ead9e565423642e4533e1547b5d2c0476fb03 (git) Affected: 895de9a3488abcdd186680f0af3cce7f2d4d4a6e , < 33fd93961557ec8e3e9958995b28684c5f949394 (git) Affected: 895de9a3488abcdd186680f0af3cce7f2d4d4a6e , < 6d8bc0dc99472d62c57c2a3d436e6ab408592bda (git) Affected: 895de9a3488abcdd186680f0af3cce7f2d4d4a6e , < 9571af2eec8023af9a1671b7f2cd4ab400011724 (git) Affected: 895de9a3488abcdd186680f0af3cce7f2d4d4a6e , < 88b33ee458a6ca5fbef6c53b9dba772da69dab68 (git) Affected: 895de9a3488abcdd186680f0af3cce7f2d4d4a6e , < 95cceadbfd52d7239bd730afdda0655287d77425 (git)
Linux	Linux	Affected: 3.15 Unaffected: 0 , < 3.15 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 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)

Show details on NVD website

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ip_vti.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1caf737e625143c6f23c32d2b747b1a3e42e5699",
              "status": "affected",
              "version": "895de9a3488abcdd186680f0af3cce7f2d4d4a6e",
              "versionType": "git"
            },
            {
              "lessThan": "32edf8aa297745226854eda2d96c0fac66c1bb15",
              "status": "affected",
              "version": "895de9a3488abcdd186680f0af3cce7f2d4d4a6e",
              "versionType": "git"
            },
            {
              "lessThan": "973ead9e565423642e4533e1547b5d2c0476fb03",
              "status": "affected",
              "version": "895de9a3488abcdd186680f0af3cce7f2d4d4a6e",
              "versionType": "git"
            },
            {
              "lessThan": "33fd93961557ec8e3e9958995b28684c5f949394",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "6d8bc0dc99472d62c57c2a3d436e6ab408592bda",
              "status": "affected",
              "version": "895de9a3488abcdd186680f0af3cce7f2d4d4a6e",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "895de9a3488abcdd186680f0af3cce7f2d4d4a6e",
              "versionType": "git"
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              "status": "affected",
              "version": "895de9a3488abcdd186680f0af3cce7f2d4d4a6e",
              "versionType": "git"
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          "product": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.15"
            },
            {
              "lessThan": "3.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "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",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "versionEndExcluding": "5.10.261",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                {
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "3.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "3.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.15",
                  "vulnerable": true
                }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip_vti: require CAP_NET_ADMIN in the device netns for changelink\n\nvti_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 vti_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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            {
              "lang": "en",
              "value": "AV:L - Exploitation requires RTM_NEWLINK changelink over a local rtnetlink socket; vti_changelink is only reachable from rtnl configuration, not from received IPsec or IPv4 packets handled by vti_input/vti_rcv_proto.\nAC:L - Once a VTI device exists with t-\u003enet differing from dev_net(dev) via IFLA_NET_NS_FD migration or IFLA_LINK_NETNSID newlink, 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 vti_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_VTI_LOCAL/REMOTE, i_key/o_key, link, and fwmark to redirect IPsec VTI traffic to an attacker-controlled endpoint, exposing decrypted inner payloads carried by the VPN tunnel in the victim link netns.\nI:H - Unauthorized changelink updates live VTI tunnel endpoints, IPsec keys, underlay netdev, and fwmark in t-\u003enet, enabling redirection and injection of IPsec-protected traffic across the namespace boundary.\nA:H - Rewriting tunnel remote/local addresses, IPsec keys, or the underlay link breaks site-to-site IPsec VPN connectivity, causing sustained loss of service for every workload depending on the affected VTI tunnel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:39:51.024Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
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          "url": "https://git.kernel.org/stable/c/32edf8aa297745226854eda2d96c0fac66c1bb15"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/95cceadbfd52d7239bd730afdda0655287d77425"
        }
      ],
      "title": "net: ip_vti: require CAP_NET_ADMIN in the device netns for changelink",
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        "engine": "bippy-1.2.0"
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72054",
    "datePublished": "2026-08-15T05:52:10.679Z",
    "dateReserved": "2026-08-09T03:40:39.903Z",
    "dateUpdated": "2026-08-17T05:39:51.024Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

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-R26Q-49RH-GWM8

CVE-2026-72054 (GCVE-0-2026-72054)

Tags

Sightings

Nomenclature