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vxlan: require CAP_NET_ADMIN in the device netns for changelink

Type: advisorySource: Official CVE List1 source record

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).

Announced Source revision 1
Original source ↗

CVE-2026-68432

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-68432

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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"
  }
]
Related CVEs
CVE-2026-68432

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41724 · Revision 1
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Publisher date
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