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CVE-2026-72061 (GCVE-0-2026-72061)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-17 05:39
VLAI
Title
net: sit: require CAP_NET_ADMIN in the device netns for changelink
Summary
In the Linux kernel, the following vulnerability has been resolved: net: sit: require CAP_NET_ADMIN in the device netns for changelink ipip6_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 ipip6_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed. sit was the one tunnel type not covered by the recent series that added this check to the other changelink() handlers.
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: 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 , < cb41b308e9d867725d965b291dd085028e36a480 (git)
Affected: 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 , < c5a0ae895432596b2f464172da8218e2d84e2932 (git)
Affected: 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 , < 7d139dec96691cde96cb40ed293e2d13d994fb4f (git)
Affected: 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 , < 388ccffbd2e7e5e4271f291085a7451865705305 (git)
Affected: 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 , < c0ea1aedb37bb979e864ed7787975434bbd9db73 (git)
Affected: 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 , < 3118e97dae533fb45964b87bbed1801afcff7c65 (git)
Affected: 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 , < 99ae3248b33df94201915d9c32e7470cdf08cfcd (git)
Affected: 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 , < 27ccb68e7cccead5d8c611665a45d23032d468b3 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.11
Unaffected: 0 , < 3.11 (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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          "product": "Linux",
          "programFiles": [
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                  "versionStartIncluding": "3.11",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sit: require CAP_NET_ADMIN in the device netns for changelink\n\nipip6_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 ipip6_changelink() on rtnl_dev_link_net_capable() at its top,\nbefore any attribute is parsed. sit was the one tunnel type not covered\nby the recent series that added this check to the other changelink()\nhandlers."
        }
      ],
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            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:L - Exploitation requires RTM_NEWLINK/RTM_SETLINK changelink over a local rtnetlink socket; ipip6_changelink is only reachable from rtnl configuration, not from received IPv4/IPv6 packets processed by ipip6_rcv.\nAC:L - Once a SIT 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 ipip6_changelink mutates tunnel state in t-\u003enet via ipip6_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 IPv6-in-IPv4 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 6rd prefix/relay settings in t-\u003enet, enabling redirection and injection of IPv6 traffic carried over the SIT tunnel.\nA:H - Rewriting tunnel remote/local addresses, underlay device, or 6rd parameters breaks 6to4, 6rd, and cross-netns IPv6 connectivity, causing sustained loss of service for every workload depending on the affected SIT tunnel."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "datePublished": "2026-08-15T05:52:15.823Z",
    "dateReserved": "2026-08-09T03:40:39.903Z",
    "dateUpdated": "2026-08-17T05:39:54.286Z",
    "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 ipip6_changelink() on rtnl_dev_link_net_capable() at its top,\\nbefore any attribute is parsed. sit was the one tunnel type not covered\\nby the recent series that added this check to the other changelink()\\nhandlers.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/sit.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5e6700b3bf98fe98d630bf9c939ad4c85ce95592\",\"lessThan\":\"cb41b308e9d867725d965b291dd085028e36a480\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5e6700b3bf98fe98d630bf9c939ad4c85ce95592\",\"lessThan\":\"c5a0ae895432596b2f464172da8218e2d84e2932\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5e6700b3bf98fe98d630bf9c939ad4c85ce95592\",\"lessThan\":\"7d139dec96691cde96cb40ed293e2d13d994fb4f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5e6700b3bf98fe98d630bf9c939ad4c85ce95592\",\"lessThan\":\"388ccffbd2e7e5e4271f291085a7451865705305\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5e6700b3bf98fe98d630bf9c939ad4c85ce95592\",\"lessThan\":\"c0ea1aedb37bb979e864ed7787975434bbd9db73\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5e6700b3bf98fe98d630bf9c939ad4c85ce95592\",\"lessThan\":\"3118e97dae533fb45964b87bbed1801afcff7c65\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5e6700b3bf98fe98d630bf9c939ad4c85ce95592\",\"lessThan\":\"99ae3248b33df94201915d9c32e7470cdf08cfcd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5e6700b3bf98fe98d630bf9c939ad4c85ce95592\",\"lessThan\":\"27ccb68e7cccead5d8c611665a45d23032d468b3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/sit.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.11\",\"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/27ccb68e7cccead5d8c611665a45d23032d468b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3118e97dae533fb45964b87bbed1801afcff7c65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/388ccffbd2e7e5e4271f291085a7451865705305\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7d139dec96691cde96cb40ed293e2d13d994fb4f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/99ae3248b33df94201915d9c32e7470cdf08cfcd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c0ea1aedb37bb979e864ed7787975434bbd9db73\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c5a0ae895432596b2f464172da8218e2d84e2932\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb41b308e9d867725d965b291dd085028e36a480\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-17T19:28:41+00:00",
      "cve": "CVE-2026-72061",
      "id": "CVE-2026-72061",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: sit: require CAP_NET_ADMIN in the device netns for changelink",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72061.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.
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Detection rules are retrieved from Rulezet.