Vulnerability-Lookup

GHSA-94F6-QRFM-PRR2

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: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink

ip6gre_changelink() and ip6erspan_changelink() operate 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 both ops on rtnl_dev_link_net_capable() at their 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-2026-72052"
  ],
  "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: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink\n\nip6gre_changelink() and ip6erspan_changelink() operate on at most two\nnetns, dev_net(dev) and the tunnel link netns t-\u003enet. They differ once\nthe device is created in or moved to a netns other than the one the\nrequest runs in. The rtnl changelink path checks CAP_NET_ADMIN only\nagainst dev_net(dev), so a caller privileged there but not in t-\u003enet can\nrewrite a tunnel that lives in t-\u003enet.\n\nGate both ops on rtnl_dev_link_net_capable() at their top, before any\nattribute is parsed.",
  "id": "GHSA-94f6-qrfm-prr2",
  "modified": "2026-08-17T06:33:06Z",
  "published": "2026-08-15T06:32:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72052"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03d8843b143ebbbfaf48511922abc6e886575a61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0caa9f348f8b5356900de77b0bb89a697c4aff20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/129f8939e5af683cec3a1a5edcb40a64636ad81e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d4d8ee002083ca4ead5353662bf8362428af57f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/220162c9fedbe992da70d70f50a10da4f45f914c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c38c8b0db3c65b597e7ece317b6cb59de3d15e69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3724dedf57761c6de52f4d604ec74f66fd61611"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f00a50876d2818bd6dc86fa98b3ef360884c53c8"
    }
  ],
  "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-2026-72052 (GCVE-0-2026-72052)

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

Title

net: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink

Summary

In the Linux kernel, the following vulnerability has been resolved: net: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink ip6gre_changelink() and ip6erspan_changelink() operate 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 both ops on rtnl_dev_link_net_capable() at their 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/129f8939e5af683ce…
https://git.kernel.org/stable/c/e3724dedf57761c6d…
https://git.kernel.org/stable/c/220162c9fedbe992d…
https://git.kernel.org/stable/c/1d4d8ee002083ca4e…
https://git.kernel.org/stable/c/0caa9f348f8b53569…
https://git.kernel.org/stable/c/03d8843b143ebbbfa…
https://git.kernel.org/stable/c/c38c8b0db3c65b597…
https://git.kernel.org/stable/c/f00a50876d2818bd6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 690afc165bb314354667f67157c1a1aea7dc797a , < 129f8939e5af683cec3a1a5edcb40a64636ad81e (git) Affected: 690afc165bb314354667f67157c1a1aea7dc797a , < e3724dedf57761c6de52f4d604ec74f66fd61611 (git) Affected: 690afc165bb314354667f67157c1a1aea7dc797a , < 220162c9fedbe992da70d70f50a10da4f45f914c (git) Affected: 690afc165bb314354667f67157c1a1aea7dc797a , < 1d4d8ee002083ca4ead5353662bf8362428af57f (git) Affected: 690afc165bb314354667f67157c1a1aea7dc797a , < 0caa9f348f8b5356900de77b0bb89a697c4aff20 (git) Affected: 690afc165bb314354667f67157c1a1aea7dc797a , < 03d8843b143ebbbfaf48511922abc6e886575a61 (git) Affected: 690afc165bb314354667f67157c1a1aea7dc797a , < c38c8b0db3c65b597e7ece317b6cb59de3d15e69 (git) Affected: 690afc165bb314354667f67157c1a1aea7dc797a , < f00a50876d2818bd6dc86fa98b3ef360884c53c8 (git) Affected: d0201d2405dac8d9b16773e97709925e397552d0 (git) Affected: 7943bb0f06365cf5e32f3cf8a6b29eeae981fb8a (git) Affected: 4.19.100 , < 4.20 (semver) Affected: 5.4.16 , < 5.5 (semver)
Linux	Linux	Affected: 5.5 Unaffected: 0 , < 5.5 (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

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ip6_gre.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "129f8939e5af683cec3a1a5edcb40a64636ad81e",
              "status": "affected",
              "version": "690afc165bb314354667f67157c1a1aea7dc797a",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "690afc165bb314354667f67157c1a1aea7dc797a",
              "versionType": "git"
            },
            {
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              "version": "690afc165bb314354667f67157c1a1aea7dc797a",
              "versionType": "git"
            },
            {
              "lessThan": "0caa9f348f8b5356900de77b0bb89a697c4aff20",
              "status": "affected",
              "version": "690afc165bb314354667f67157c1a1aea7dc797a",
              "versionType": "git"
            },
            {
              "lessThan": "03d8843b143ebbbfaf48511922abc6e886575a61",
              "status": "affected",
              "version": "690afc165bb314354667f67157c1a1aea7dc797a",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
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              "version": "d0201d2405dac8d9b16773e97709925e397552d0",
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            {
              "status": "affected",
              "version": "7943bb0f06365cf5e32f3cf8a6b29eeae981fb8a",
              "versionType": "git"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.100",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.16",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ip6_gre.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.5"
            },
            {
              "lessThan": "5.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
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              "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": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
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                },
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                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink\n\nip6gre_changelink() and ip6erspan_changelink() operate on at most two\nnetns, dev_net(dev) and the tunnel link netns t-\u003enet. They differ once\nthe device is created in or moved to a netns other than the one the\nrequest runs in. The rtnl changelink path checks CAP_NET_ADMIN only\nagainst dev_net(dev), so a caller privileged there but not in t-\u003enet can\nrewrite a tunnel that lives in t-\u003enet.\n\nGate both ops on rtnl_dev_link_net_capable() at their top, before any\nattribute 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 - The bug is reached only via rtnetlink (RTM_NEWLINK changelink) on a local NETLINK_ROUTE socket, not by processing attacker-controlled network packets; kernel guidance classifies rtnetlink control-plane bugs as Local.\nAC:L - With CAP_NET_ADMIN in dev_net(dev) (e.g. via user namespaces), an attacker can move a cross-netns ip6gre device or use an existing one, then issue a single deterministic changelink; no uncontrollable races or rare kernel configs are required.\nPR:L - Exploitation requires CAP_NET_ADMIN in dev_net(dev) to issue RTM_NEWLINK changelink; this capability is available to unprivileged users creating user+network namespaces (unshare -Urn), not only real init-namespace root.\nUI:N - No victim interaction is needed once the attacker has a suitable ip6gre/ip6gretap/ip6erspan netdev handle and issues rtnetlink changelink requests to rewrite tunnel parameters.\nS:C - The flaw crosses the network-namespace security boundary: a caller authorized only in dev_net(dev) can modify ip6gre state and routing tables in t-\u003enet (another tenant/host namespace), violating netns isolation relied on by containers and Kubernetes.\nC:H - changelink can point tunnels/ERSPAN mirroring at attacker-chosen IPv6 endpoints and keys, enabling interception and collection of traffic that other namespaces expect to be privately encapsulated or mirrored only to trusted collectors.\nI:H - The attacker can arbitrarily rewrite tunnel link parameters (local/remote addresses, keys, encap, fwmark, ERSPAN index) and rehash tunnel state in the victim link netns, redirecting or corrupting network paths outside their authorization.\nA:H - Rewriting or unlinking tunnel entries can immediately break GRE/ERSPAN connectivity depended on for production links, causing sustained network outage or repeated loss of availability without kernel interaction from the victim."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:39:48.851Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/129f8939e5af683cec3a1a5edcb40a64636ad81e"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3724dedf57761c6de52f4d604ec74f66fd61611"
        },
        {
          "url": "https://git.kernel.org/stable/c/220162c9fedbe992da70d70f50a10da4f45f914c"
        },
        {
          "url": "https://git.kernel.org/stable/c/1d4d8ee002083ca4ead5353662bf8362428af57f"
        },
        {
          "url": "https://git.kernel.org/stable/c/0caa9f348f8b5356900de77b0bb89a697c4aff20"
        },
        {
          "url": "https://git.kernel.org/stable/c/03d8843b143ebbbfaf48511922abc6e886575a61"
        },
        {
          "url": "https://git.kernel.org/stable/c/c38c8b0db3c65b597e7ece317b6cb59de3d15e69"
        },
        {
          "url": "https://git.kernel.org/stable/c/f00a50876d2818bd6dc86fa98b3ef360884c53c8"
        }
      ],
      "title": "net: ip6_gre: 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-2026-72052",
    "datePublished": "2026-08-15T05:52:09.194Z",
    "dateReserved": "2026-08-09T03:40:39.902Z",
    "dateUpdated": "2026-08-17T05:39:48.851Z",
    "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-94F6-QRFM-PRR2

CVE-2026-72052 (GCVE-0-2026-72052)

Tags

Sightings

Nomenclature