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ip_gre: Reject enabling collect metadata through changelink

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ip_gre: Reject enabling collect metadata through changelink ipgre_netlink_parms() can enable collect_md on an existing GRE, GRETAP or ERSPAN device. Unlike newlink, changelink does not enforce metadata tunnel uniqueness. Converting a non-metadata device can therefore replace the metadata receive entry for another device of the same type in the same netns. Deleting either device then clears the shared entry, breaking metadata receive lookup for the surviving device. If parameter validation fails after collect_md is set, deleting the modified device can also clear an entry it never owned. Reject enabling metadata mode in both changelink callbacks before any encapsulation or tunnel parameters are modified. Allow requests that repeat the metadata attribute on an existing metadata device.

Announced Source revision 1
Original source ↗

CVE-2026-98569

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-2026-98569

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": "2e15ea390e6f4466655066d97e22ec66870a042c",
        "lessThan": "c80315da84998b69b8829785a174b0bf72a81992",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
        "lessThan": "cff8b520312e750ad38967c30128e1534cbf9484",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
        "lessThan": "1dc759571f3df14891175fc52527f7624ba01322",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
        "lessThan": "da2e0cfbb620b199927a1e5b93b7cfde32083c7d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
        "lessThan": "2e54d53b65e296b4b4bdc2cdd3b2b58dfa8d8c5c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
        "lessThan": "bdd41b96e814300c66222cf4e47ecb8aef995656",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
        "lessThan": "63c5e48d6f7f5722a48f63e13e961dc5302894ed",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
        "lessThan": "a3f315be9d30eeb6938d11fa17fd4b32d52f7c42",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv4/ip_gre.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv4/ip_gre.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98569

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38588 · Revision 1
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Publisher date
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