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

Vulnerability from cvelistv5 – Published: 2026-08-12 00:07 – Updated: 2026-10-16 15:53
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
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:48 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6664 records in the last 180 days details
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)
guessed Create a notification for this product.
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            "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)."
          }
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        "id": "CVE-2026-68432",
        "lastModified": "2026-10-16T16:19:57.880",
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          },
          {
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            "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"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-08T21:17:05+00:00",
      "cve": "CVE-2026-68432",
      "id": "CVE-2026-68432",
      "initial_release_date": "2026-08-12T00:00:00+00:00",
      "product_status:fixed": "453",
      "product_status:known_affected": "128",
      "product_status:known_not_affected": "14",
      "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"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-68432",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:48:52.480523Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T15:48:53.261Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/vxlan/vxlan_core.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "b95a8743e58f7efed5ddc4cb73829b66f17feab0",
                  "status": "affected",
                  "version": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
                  "versionType": "git"
                },
                {
                  "lessThan": "7465ade989ba84adc2bfa58bad3ca25d249f0f7a",
                  "status": "affected",
                  "version": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
                  "versionType": "git"
                },
                {
                  "lessThan": "0aa580a8bbbed2507b4582a1f0ef581d480d06ed",
                  "status": "affected",
                  "version": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
                  "versionType": "git"
                },
                {
                  "lessThan": "b3793d7dccb192ffff29894d11824db6251acdd5",
                  "status": "affected",
                  "version": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
                  "versionType": "git"
                },
                {
                  "lessThan": "32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f",
                  "status": "affected",
                  "version": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
                  "versionType": "git"
                },
                {
                  "lessThan": "730c7e5fea7f06e0cdf21c547222ec93234fd1d6",
                  "status": "affected",
                  "version": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
                  "versionType": "git"
                },
                {
                  "lessThan": "e8ad0d311e225939a9a6c745d6cc384c7364ec87",
                  "status": "affected",
                  "version": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
                  "versionType": "git"
                },
                {
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                  "status": "affected",
                  "version": "8bcdc4f3a20be949df54b67e5ae2734daabb5792",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/vxlan/vxlan_core.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.11"
                },
                {
                  "lessThan": "4.11",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.265",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.216",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.183",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.148",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.101",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.42",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.1.*",
                  "status": "unaffected",
                  "version": "7.1.6",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.2",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.265",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.216",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.183",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.148",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.101",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.42",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.1.6",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.2",
                      "versionStartIncluding": "4.11",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "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"
          },
          "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"
            }
          ],
          "title": "vxlan: require CAP_NET_ADMIN in the device netns for changelink",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-68432",
        "datePublished": "2026-08-12T00:07:18.806Z",
        "dateReserved": "2026-07-30T09:28:09.393Z",
        "dateUpdated": "2026-10-16T15:53:13.375Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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