CVE-2026-68432 (GCVE-0-2026-68432)
Vulnerability from cvelistv5
Published
2026-08-12 00:07
Modified
2026-10-19 21:09
Severity ?
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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).
References
Impacted products
Vendor Product Version
Linux Linux Version: 8bcdc4f3a20be949df54b67e5ae2734daabb5792
Version: 8bcdc4f3a20be949df54b67e5ae2734daabb5792
Version: 8bcdc4f3a20be949df54b67e5ae2734daabb5792
Version: 8bcdc4f3a20be949df54b67e5ae2734daabb5792
Version: 8bcdc4f3a20be949df54b67e5ae2734daabb5792
Version: 8bcdc4f3a20be949df54b67e5ae2734daabb5792
Version: 8bcdc4f3a20be949df54b67e5ae2734daabb5792
Version: 8bcdc4f3a20be949df54b67e5ae2734daabb5792
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"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\"}], \"programFiles\": [\"drivers/net/vxlan/vxlan_core.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.265\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.183\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.148\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.101\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.42\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/vxlan/vxlan_core.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b95a8743e58f7efed5ddc4cb73829b66f17feab0\"}, {\"url\": \"https://git.kernel.org/stable/c/7465ade989ba84adc2bfa58bad3ca25d249f0f7a\"}, {\"url\": \"https://git.kernel.org/stable/c/0aa580a8bbbed2507b4582a1f0ef581d480d06ed\"}, {\"url\": \"https://git.kernel.org/stable/c/b3793d7dccb192ffff29894d11824db6251acdd5\"}, {\"url\": \"https://git.kernel.org/stable/c/32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f\"}, {\"url\": \"https://git.kernel.org/stable/c/730c7e5fea7f06e0cdf21c547222ec93234fd1d6\"}, {\"url\": \"https://git.kernel.org/stable/c/e8ad0d311e225939a9a6c745d6cc384c7364ec87\"}, {\"url\": \"https://git.kernel.org/stable/c/3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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).\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:35:30.743Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68432\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:09:10.150Z\", \"dateReserved\": \"2026-07-30T09:28:09.393Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-12T00:07:18.806Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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