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CVE-2026-72055 (GCVE-0-2026-72055)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-17 05:39
VLAI
Title
net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink vti6_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 vti6_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: 61220ab349485d911083d0b7990ccd3db6c63297 , < f5254e7766b4ac02b66b2ccef896cd278503cb11 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < ef897249dc957089e6f7f11ceea699e093ad51bd (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < c64b9ae7eb97e81d54b792910a3aeafd92566c79 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < b2b61c540571b3cc2f461e2a579ba2cc8c2a52cf (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < 0b2f9c908f930ec4be17d389723f9a202d6a883c (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < f97e93ebf2f9b8ef3b87f7a9371255e84d151587 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < e2ac3b242c37dff323a964962e43854f4b1a2b79 (git)
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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)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink\n\nvti6_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 vti6_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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              "value": "AV:L - The flaw is only reachable through rtnetlink configuration (RTM_NEWLINK changelink via netlink socket), not from remote IPv6/IPsec packets processed by vti6_rcv; kernel guidance classifies netlink/tc paths as Local.\nAC:L - Exploitation is a deterministic attacker-controlled sequence (create vti6, move netns so dev_net(dev) != t-\u003enet, issue changelink) with no races, timing dependencies, or uncontrollable victim state once the cross-namespace device exists.\nPR:L - The rtnl entry path requires CAP_NET_ADMIN in dev_net(dev), obtainable by an unprivileged local user inside a user+network namespace (unshare --user --map-root-user --net) without init-namespace root or CAP_NET_ADMIN in t-\u003enet.\nUI:N - Exploitation 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 - vti6_changelink mutates live tunnel state and hash tables in t-\u003enet while authorization is checked only against dev_net(dev), crossing from the attacker\u0027s net/user namespace into another tenant\u0027s or the host\u0027s network namespace IPsec tunnel configuration.\nC:H - Unauthorized changelink can rewrite IFLA_VTI_LOCAL/REMOTE, IKEY/OKEY, and FWMARK to redirect IPv6 IPsec VTI traffic through attacker-controlled endpoints, exposing decrypted tunneled payloads on the receive path.\nI:H - The attacker can arbitrarily reconfigure live vti6 tunnel endpoints, keys, link binding, and routing metadata in t-\u003enet without authorization, enabling traffic redirection and injection across the victim namespace\u0027s IPsec VPN paths.\nA:H - Rewriting or invalidating vti6 tunnel endpoints, keys, or link configuration can break production IPsec VPN overlays and dependent services, causing sustained loss of connectivity for workloads in the victim network namespace."
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        "shortName": "Linux"
      },
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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 vti6_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/ipv6/ip6_vti.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"f5254e7766b4ac02b66b2ccef896cd278503cb11\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"ef897249dc957089e6f7f11ceea699e093ad51bd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"c64b9ae7eb97e81d54b792910a3aeafd92566c79\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"b2b61c540571b3cc2f461e2a579ba2cc8c2a52cf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"0b2f9c908f930ec4be17d389723f9a202d6a883c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"f97e93ebf2f9b8ef3b87f7a9371255e84d151587\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"e2ac3b242c37dff323a964962e43854f4b1a2b79\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/ip6_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/0b2f9c908f930ec4be17d389723f9a202d6a883c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b2b61c540571b3cc2f461e2a579ba2cc8c2a52cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c64b9ae7eb97e81d54b792910a3aeafd92566c79\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2ac3b242c37dff323a964962e43854f4b1a2b79\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ef897249dc957089e6f7f11ceea699e093ad51bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f5254e7766b4ac02b66b2ccef896cd278503cb11\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6e8b52a2cb3bbd72ddc2d44e474b907b9dcf5ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f97e93ebf2f9b8ef3b87f7a9371255e84d151587\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T19:07:46+00:00",
      "cve": "CVE-2026-72055",
      "id": "CVE-2026-72055",
      "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: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72055.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.