CVE-2026-68432 (GCVE-0-2026-68432)

Vulnerability from cvelistv5 – Published: 2026-08-12 00:07 – Updated: 2026-08-19 16:35
VLAI
Title
vxlan: require CAP_NET_ADMIN in the device netns for changelink
Summary
In the Linux kernel, the following vulnerability has been resolved: vxlan: require CAP_NET_ADMIN in the device netns for changelink A tunnel changelink() operates on at most two netns, dev_net(dev) and the sticky underlay netns vxlan->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 vxlan->net can rewrite a vxlan device whose underlay lives in vxlan->net. vxlan_changelink() validates and applies the new configuration against vxlan->net (vxlan_config_validate(vxlan->net, ...)) and can reopen the underlay socket in that netns, so the same reasoning as the tunnel changelink series applies here. Gate vxlan_changelink() with rtnl_dev_link_net_capable(), at the top of the op before any attribute is parsed, matching ipgre_changelink() and the rest of the "require CAP_NET_ADMIN in the device netns for changelink" series. Found by 0sec automated security-research tooling (https://0sec.ai).
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: 8bcdc4f3a20be949df54b67e5ae2734daabb5792 , < b95a8743e58f7efed5ddc4cb73829b66f17feab0 (git)
Affected: 8bcdc4f3a20be949df54b67e5ae2734daabb5792 , < 7465ade989ba84adc2bfa58bad3ca25d249f0f7a (git)
Affected: 8bcdc4f3a20be949df54b67e5ae2734daabb5792 , < 0aa580a8bbbed2507b4582a1f0ef581d480d06ed (git)
Affected: 8bcdc4f3a20be949df54b67e5ae2734daabb5792 , < b3793d7dccb192ffff29894d11824db6251acdd5 (git)
Affected: 8bcdc4f3a20be949df54b67e5ae2734daabb5792 , < 32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f (git)
Affected: 8bcdc4f3a20be949df54b67e5ae2734daabb5792 , < 730c7e5fea7f06e0cdf21c547222ec93234fd1d6 (git)
Affected: 8bcdc4f3a20be949df54b67e5ae2734daabb5792 , < e8ad0d311e225939a9a6c745d6cc384c7364ec87 (git)
Affected: 8bcdc4f3a20be949df54b67e5ae2734daabb5792 , < 3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e (git)
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Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: require CAP_NET_ADMIN in the device netns for changelink\n\nA tunnel changelink() operates on at most two netns, dev_net(dev) and\nthe sticky underlay netns vxlan-\u003enet. They differ once the device is\ncreated in or moved to a netns other than the one the request runs in.\nThe rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev),\nso a caller privileged there but not in vxlan-\u003enet can rewrite a vxlan\ndevice whose underlay lives in vxlan-\u003enet.\n\nvxlan_changelink() validates and applies the new configuration against\nvxlan-\u003enet (vxlan_config_validate(vxlan-\u003enet, ...)) and can reopen the\nunderlay socket in that netns, so the same reasoning as the tunnel\nchangelink series applies here.\n\nGate vxlan_changelink() with rtnl_dev_link_net_capable(), at the top of\nthe op before any attribute is parsed, matching ipgre_changelink() and\nthe rest of the \"require CAP_NET_ADMIN in the device netns for\nchangelink\" series.\n\nFound by 0sec automated security-research tooling (https://0sec.ai)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires issuing an RTM_NEWLINK changelink request over an rtnetlink socket on the local system, matching the kernel guidance that netlink configuration paths are Local.\nAC:L - Once a cross-namespace vxlan device is present in the caller\u0027s netns, the missing check is bypassed by a single deterministic netlink changelink call with no race, timing, or memory-layout dependency.\nPR:L - The rtnl entry path only requires CAP_NET_ADMIN in dev_net(dev), which an unprivileged user obtains inside a user namespace via unshare --user --map-root-user --net; no privilege in the underlay netns vxlan-\u003enet is needed.\nUI:N - The attack is fully programmatic through netlink from the attacker\u0027s own process; no victim action such as mounting, opening a file, or clicking is required.\nS:C - Authorization is evaluated against dev_net(dev) while the configuration is validated and applied against vxlan-\u003enet, so the impact crosses from the attacker\u0027s net/user namespace into another tenant\u0027s or the host\u0027s network namespace.\nC:H - The attacker can rewrite IFLA_VXLAN_GROUP/LOCAL and the underlay IFLA_VXLAN_LINK so encapsulated overlay traffic in the victim netns is sent to an attacker-controlled endpoint, exposing tunneled payloads.\nI:H - Unauthorized changelink mutates live tunnel state in the victim underlay netns (remote/local addresses, lower device, TOS/TTL/label, learning and proxy/RSC flags, default-remote FDB entries), enabling redirection and injection of overlay traffic.\nA:H - Rewriting the remote group, source address, or lower device tears down and re-establishes multicast group membership and forwarding state, causing sustained loss of connectivity for every service riding the affected VXLAN overlay."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:35:30.743Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/b95a8743e58f7efed5ddc4cb73829b66f17feab0"
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          "url": "https://git.kernel.org/stable/c/7465ade989ba84adc2bfa58bad3ca25d249f0f7a"
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      "title": "vxlan: require CAP_NET_ADMIN in the device netns for changelink",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68432",
    "datePublished": "2026-08-12T00:07:18.806Z",
    "dateReserved": "2026-07-30T09:28:09.393Z",
    "dateUpdated": "2026-08-19T16:35:30.743Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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They differ once the device is\\ncreated in or moved to a netns other than the one the request runs in.\\nThe rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev),\\nso a caller privileged there but not in vxlan-\u003enet can rewrite a vxlan\\ndevice whose underlay lives in vxlan-\u003enet.\\n\\nvxlan_changelink() validates and applies the new configuration against\\nvxlan-\u003enet (vxlan_config_validate(vxlan-\u003enet, ...)) and can reopen the\\nunderlay socket in that netns, so the same reasoning as the tunnel\\nchangelink series applies here.\\n\\nGate vxlan_changelink() with rtnl_dev_link_net_capable(), at the top of\\nthe op before any attribute is parsed, matching ipgre_changelink() and\\nthe rest of the \\\"require CAP_NET_ADMIN in the device netns for\\nchangelink\\\" series.\\n\\nFound by 0sec automated security-research tooling (https://0sec.ai).\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/vxlan/vxlan_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8bcdc4f3a20be949df54b67e5ae2734daabb5792\",\"lessThan\":\"b95a8743e58f7efed5ddc4cb73829b66f17feab0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8bcdc4f3a20be949df54b67e5ae2734daabb5792\",\"lessThan\":\"7465ade989ba84adc2bfa58bad3ca25d249f0f7a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8bcdc4f3a20be949df54b67e5ae2734daabb5792\",\"lessThan\":\"0aa580a8bbbed2507b4582a1f0ef581d480d06ed\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8bcdc4f3a20be949df54b67e5ae2734daabb5792\",\"lessThan\":\"b3793d7dccb192ffff29894d11824db6251acdd5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8bcdc4f3a20be949df54b67e5ae2734daabb5792\",\"lessThan\":\"32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8bcdc4f3a20be949df54b67e5ae2734daabb5792\",\"lessThan\":\"730c7e5fea7f06e0cdf21c547222ec93234fd1d6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8bcdc4f3a20be949df54b67e5ae2734daabb5792\",\"lessThan\":\"e8ad0d311e225939a9a6c745d6cc384c7364ec87\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8bcdc4f3a20be949df54b67e5ae2734daabb5792\",\"lessThan\":\"3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/vxlan/vxlan_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"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/0aa580a8bbbed2507b4582a1f0ef581d480d06ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/730c7e5fea7f06e0cdf21c547222ec93234fd1d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7465ade989ba84adc2bfa58bad3ca25d249f0f7a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b3793d7dccb192ffff29894d11824db6251acdd5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b95a8743e58f7efed5ddc4cb73829b66f17feab0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8ad0d311e225939a9a6c745d6cc384c7364ec87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-13T23:26:51+00:00",
      "cve": "CVE-2026-68432",
      "id": "CVE-2026-68432",
      "initial_release_date": "2026-08-12T00:00:00+00:00",
      "product_status:known_affected": "245",
      "product_status:known_not_affected": "30",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vxlan: require CAP_NET_ADMIN in the device netns for changelink",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68432.json",
      "version": "3"
    }
  }
}



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