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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-17 05:39
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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          "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."
        }
      ],
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            "baseSeverity": "HIGH",
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          },
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              "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."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2026-08-09T03:40:39.903Z",
    "dateUpdated": "2026-08-17T05:39:51.024Z",
    "state": "PUBLISHED"
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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 vti_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/ip_vti.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"895de9a3488abcdd186680f0af3cce7f2d4d4a6e\",\"lessThan\":\"1caf737e625143c6f23c32d2b747b1a3e42e5699\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"895de9a3488abcdd186680f0af3cce7f2d4d4a6e\",\"lessThan\":\"32edf8aa297745226854eda2d96c0fac66c1bb15\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"895de9a3488abcdd186680f0af3cce7f2d4d4a6e\",\"lessThan\":\"973ead9e565423642e4533e1547b5d2c0476fb03\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"895de9a3488abcdd186680f0af3cce7f2d4d4a6e\",\"lessThan\":\"33fd93961557ec8e3e9958995b28684c5f949394\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"895de9a3488abcdd186680f0af3cce7f2d4d4a6e\",\"lessThan\":\"6d8bc0dc99472d62c57c2a3d436e6ab408592bda\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"895de9a3488abcdd186680f0af3cce7f2d4d4a6e\",\"lessThan\":\"9571af2eec8023af9a1671b7f2cd4ab400011724\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"895de9a3488abcdd186680f0af3cce7f2d4d4a6e\",\"lessThan\":\"88b33ee458a6ca5fbef6c53b9dba772da69dab68\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"895de9a3488abcdd186680f0af3cce7f2d4d4a6e\",\"lessThan\":\"95cceadbfd52d7239bd730afdda0655287d77425\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/ip_vti.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"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/1caf737e625143c6f23c32d2b747b1a3e42e5699\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/32edf8aa297745226854eda2d96c0fac66c1bb15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/33fd93961557ec8e3e9958995b28684c5f949394\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6d8bc0dc99472d62c57c2a3d436e6ab408592bda\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/88b33ee458a6ca5fbef6c53b9dba772da69dab68\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9571af2eec8023af9a1671b7f2cd4ab400011724\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95cceadbfd52d7239bd730afdda0655287d77425\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/973ead9e565423642e4533e1547b5d2c0476fb03\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T23:39:45+00:00",
      "cve": "CVE-2026-72054",
      "id": "CVE-2026-72054",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: ip_vti: require CAP_NET_ADMIN in the device netns for changelink",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72054.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.

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  • 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.
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