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CVE-2026-98569

Linux: ip_gre: Reject enabling collect metadata through changelink

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.21%Chance of exploitation activity in the next 30 days, higher than 10% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1dc759571f3df14891175fc52527f7624ba01322Also 2e54d53b65e296b4b4bdc2cdd3b2b58dfa8d8c5c, 63c5e48d6f7f5722a48f63e13e961dc5302894edCVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 1dc759571f3df14891175fc52527f7624ba01322LinuxCVE List
  • 2e54d53b65e296b4b4bdc2cdd3b2b58dfa8d8c5cLinuxCVE List
  • 63c5e48d6f7f5722a48f63e13e961dc5302894edLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 18

  • Linuxaffected: 2e15ea390e6f4466655066d97e22ec66870a042c before c80315da84998b69b8829785a174b0bf72a81992CVE List
  • Linuxaffected: 2e15ea390e6f4466655066d97e22ec66870a042c before cff8b520312e750ad38967c30128e1534cbf9484CVE List
  • Linuxaffected: 2e15ea390e6f4466655066d97e22ec66870a042c before 1dc759571f3df14891175fc52527f7624ba01322CVE List
  • Linuxaffected: 2e15ea390e6f4466655066d97e22ec66870a042c before da2e0cfbb620b199927a1e5b93b7cfde32083c7dCVE List
  • Linuxaffected: 2e15ea390e6f4466655066d97e22ec66870a042c before 2e54d53b65e296b4b4bdc2cdd3b2b58dfa8d8c5cCVE List
  • Linuxaffected: 2e15ea390e6f4466655066d97e22ec66870a042c before bdd41b96e814300c66222cf4e47ecb8aef995656CVE List
  • Linuxaffected: 2e15ea390e6f4466655066d97e22ec66870a042c before 63c5e48d6f7f5722a48f63e13e961dc5302894edCVE List
  • Linuxaffected: 2e15ea390e6f4466655066d97e22ec66870a042c before a3f315be9d30eeb6938d11fa17fd4b32d52f7c42CVE List
  • Linuxaffected: 4.3CVE List
  • Linuxunaffected: all versions before 4.3CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.55 through 6.18.*CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8