CVE-2026-72051 (GCVE-0-2026-72051)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-23 12:46
VLAI
Title
net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink ip6_tnl_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 ip6_tnl_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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0bd8762824e73a3cce7b7560a97463301764b616 , < 2d53ee7daabe733deb81f51d2cc90188f8ad59a1 (git)
Affected: 0bd8762824e73a3cce7b7560a97463301764b616 , < 82e53e7281c71e174f9f5877c566a623c637b406 (git)
Affected: 0bd8762824e73a3cce7b7560a97463301764b616 , < 5252db8fb604321133138c7069d6fc3fcd89cdee (git)
Affected: 0bd8762824e73a3cce7b7560a97463301764b616 , < 2636d061bc237a2446a146e42dcc6563acfa7432 (git)
Affected: 0bd8762824e73a3cce7b7560a97463301764b616 , < 7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa (git)
Affected: 0bd8762824e73a3cce7b7560a97463301764b616 , < 234cd54fc500f69db43e37de38603da617fbbeea (git)
Affected: 0bd8762824e73a3cce7b7560a97463301764b616 , < d4bcc202a3530c856e1cb183384bc9cc8fddab22 (git)
Affected: 0bd8762824e73a3cce7b7560a97463301764b616 , < 2496fa0b7d180b3ad356b514e7ff93bb14e6140a (git)
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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: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 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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{
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        }
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              "value": "AV:L - Exploitation requires RTM_NEWLINK changelink over a local rtnetlink socket; ip6_tnl_changelink is only reachable from rtnl configuration, not from received IPv6 packets processed by ip6_tnl_rcv.\nAC:L - Once an ip6tnl device exists with t-\u003enet differing from dev_net(dev) (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 ip6_tnl_changelink mutates tunnel state in t-\u003enet via ip6_tnl_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 IPv6/IPv4-over-IPv6 tunnel 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 link, encap ports, and flowinfo/fwmark in t-\u003enet, enabling redirection and injection of traffic carried over the ip6tnl tunnel.\nA:H - Rewriting tunnel remote/local addresses, underlay device, or encap parameters breaks cross-netns IPv6 tunnel connectivity, causing sustained loss of service for every workload depending on the affected ip6tnl tunnel."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "cveId": "CVE-2026-72051",
    "datePublished": "2026-08-15T05:52:08.445Z",
    "dateReserved": "2026-08-09T03:40:39.902Z",
    "dateUpdated": "2026-08-23T12:46:34.252Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink\n\nip6_tnl_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 ip6_tnl_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed."
          }
        ],
        "id": "CVE-2026-72051",
        "lastModified": "2026-08-23T13:16:38.300",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-08-15T06:21:14.423",
        "references": [
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            "url": "https://git.kernel.org/stable/c/234cd54fc500f69db43e37de38603da617fbbeea"
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            "url": "https://git.kernel.org/stable/c/7f68f7928484f463a5bc0d50e6fdd8d16f55a5aa"
          },
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        "vulnStatus": "Received"
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      "current_release_date": "2026-08-17T18:54:36+00:00",
      "cve": "CVE-2026-72051",
      "id": "CVE-2026-72051",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72051.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-15T01:30:44Z",
      "cve": "CVE-2026-72051",
      "id": "CVE-2026-72051",
      "initial_release_date": "2026-08-27T00:24:00Z",
      "product_status:known_affected": "358",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72051",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72051.json",
      "version": "5"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.