FKIE_CVE-2026-98569

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-19 10:19
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1dc759571f3df14891175fc52527f7624ba01322
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e54d53b65e296b4b4bdc2cdd3b2b58dfa8d8c5c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/63c5e48d6f7f5722a48f63e13e961dc5302894ed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a3f315be9d30eeb6938d11fa17fd4b32d52f7c42
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bdd41b96e814300c66222cf4e47ecb8aef995656
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c80315da84998b69b8829785a174b0bf72a81992
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cff8b520312e750ad38967c30128e1534cbf9484
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da2e0cfbb620b199927a1e5b93b7cfde32083c7d
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ip_gre.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c80315da84998b69b8829785a174b0bf72a81992",
              "status": "affected",
              "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
              "versionType": "git"
            },
            {
              "lessThan": "cff8b520312e750ad38967c30128e1534cbf9484",
              "status": "affected",
              "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
              "versionType": "git"
            },
            {
              "lessThan": "1dc759571f3df14891175fc52527f7624ba01322",
              "status": "affected",
              "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
              "versionType": "git"
            },
            {
              "lessThan": "da2e0cfbb620b199927a1e5b93b7cfde32083c7d",
              "status": "affected",
              "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
              "versionType": "git"
            },
            {
              "lessThan": "2e54d53b65e296b4b4bdc2cdd3b2b58dfa8d8c5c",
              "status": "affected",
              "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
              "versionType": "git"
            },
            {
              "lessThan": "bdd41b96e814300c66222cf4e47ecb8aef995656",
              "status": "affected",
              "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
              "versionType": "git"
            },
            {
              "lessThan": "63c5e48d6f7f5722a48f63e13e961dc5302894ed",
              "status": "affected",
              "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
              "versionType": "git"
            },
            {
              "lessThan": "a3f315be9d30eeb6938d11fa17fd4b32d52f7c42",
              "status": "affected",
              "version": "2e15ea390e6f4466655066d97e22ec66870a042c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ip_gre.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.3"
            },
            {
              "lessThan": "4.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip_gre: Reject enabling collect metadata through changelink\n\nipgre_netlink_parms() can enable collect_md on an existing GRE, GRETAP\nor ERSPAN device. Unlike newlink, changelink does not enforce metadata\ntunnel uniqueness. Converting a non-metadata device can therefore\nreplace the metadata receive entry for another device of the same type\nin the same netns. Deleting either device then clears the shared entry,\nbreaking metadata receive lookup for the surviving device.\n\nIf parameter validation fails after collect_md is set, deleting the\nmodified device can also clear an entry it never owned.\n\nReject enabling metadata mode in both changelink callbacks before any\nencapsulation or tunnel parameters are modified. Allow requests that\nrepeat the metadata attribute on an existing metadata device."
    }
  ],
  "id": "CVE-2026-98569",
  "lastModified": "2026-10-19T10:19:14.887",
  "metrics": {},
  "published": "2026-10-18T16:17:09.113",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1dc759571f3df14891175fc52527f7624ba01322"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2e54d53b65e296b4b4bdc2cdd3b2b58dfa8d8c5c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/63c5e48d6f7f5722a48f63e13e961dc5302894ed"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a3f315be9d30eeb6938d11fa17fd4b32d52f7c42"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bdd41b96e814300c66222cf4e47ecb8aef995656"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c80315da84998b69b8829785a174b0bf72a81992"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cff8b520312e750ad38967c30128e1534cbf9484"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da2e0cfbb620b199927a1e5b93b7cfde32083c7d"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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