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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-23 12:46
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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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                  "versionStartIncluding": "3.12",
                  "vulnerable": true
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              "operator": "OR"
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          "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."
        }
      ],
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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; 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."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-08-15T05:52:09.924Z",
    "dateReserved": "2026-08-09T03:40:39.902Z",
    "dateUpdated": "2026-08-23T12:46:35.344Z",
    "state": "PUBLISHED"
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      "date": "2026-09-04",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/ipip.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6c742e714d8c282fd8f8b22d3e20b5141738c1ee\",\"lessThan\":\"a7d2642a50282322bc33f34ee7305f2b793df494\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c742e714d8c282fd8f8b22d3e20b5141738c1ee\",\"lessThan\":\"068ad9b85f681755f751ebab82ae98146cec163d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c742e714d8c282fd8f8b22d3e20b5141738c1ee\",\"lessThan\":\"91571643e554ae89a91942380d5f5361fb7060a2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c742e714d8c282fd8f8b22d3e20b5141738c1ee\",\"lessThan\":\"983cc4aa7e6f633b34c3ee743771252d7afa9a90\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c742e714d8c282fd8f8b22d3e20b5141738c1ee\",\"lessThan\":\"26544021d5c49cc6ae8a968ccb5033e6363854a4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c742e714d8c282fd8f8b22d3e20b5141738c1ee\",\"lessThan\":\"68cadc3698c7de88966d306d12ec9c6217da228a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c742e714d8c282fd8f8b22d3e20b5141738c1ee\",\"lessThan\":\"d49edcc65e0a37cc9b386a94415c5d6670ca8b71\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c742e714d8c282fd8f8b22d3e20b5141738c1ee\",\"lessThan\":\"8211a26324667980a463c069469a818e71207e02\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/ipip.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/068ad9b85f681755f751ebab82ae98146cec163d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/26544021d5c49cc6ae8a968ccb5033e6363854a4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/68cadc3698c7de88966d306d12ec9c6217da228a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8211a26324667980a463c069469a818e71207e02\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91571643e554ae89a91942380d5f5361fb7060a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/983cc4aa7e6f633b34c3ee743771252d7afa9a90\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7d2642a50282322bc33f34ee7305f2b793df494\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d49edcc65e0a37cc9b386a94415c5d6670ca8b71\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T18:54:41+00:00",
      "cve": "CVE-2026-72053",
      "id": "CVE-2026-72053",
      "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: ipip: require CAP_NET_ADMIN in the device netns for changelink",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72053.json",
      "version": "3"
    }
  }
}



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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

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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.