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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-10-19 21:19
VLAI
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
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:50 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6993 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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            "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."
          }
        ],
        "id": "CVE-2026-72052",
        "lastModified": "2026-10-19T22:17:24.120",
        "metrics": {
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                "value": "CWE-862"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
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    "redhat_vex": {
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      "current_release_date": "2026-10-08T21:17:09+00:00",
      "cve": "CVE-2026-72052",
      "id": "CVE-2026-72052",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:fixed": "453",
      "product_status:known_affected": "99",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72052.json",
      "version": "3"
    },
    "vulnrichment": {
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            "metrics": [
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                  "content": {
                    "id": "CVE-2026-72052",
                    "options": [
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                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:50:53.707122Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-862",
                    "description": "CWE-862 Missing Authorization",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T15:50:54.307Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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                  "version": "7.2",
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                  "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."
                }
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            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "assignerShortName": "Linux",
        "cveId": "CVE-2026-72052",
        "datePublished": "2026-08-15T05:52:09.194Z",
        "dateReserved": "2026-08-09T03:40:39.902Z",
        "dateUpdated": "2026-10-19T21:19:24.924Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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