{"id":"CVE-2026-98569","title":"kernel: ip_gre: Reject enabling collect metadata through changelink (CVE-2026-98569)","summary":"A flaw was found in the Linux kernel's Generic Routing Encapsulation (GRE) subsystem. A local user with network administration privileges could cause a Denial of Service (DoS) by enabling metadata collection on an existing GRE network devi…","severity":"medium","cvss":4.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-694","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-20","sourceUpdated":"2026-10-20T02:56:59+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98569.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98569.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98569"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554918"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98569"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98569"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98569.mbox"},{"url":"https://git.kernel.org/stable/c/c80315da84998b69b8829785a174b0bf72a81992"},{"url":"https://git.kernel.org/stable/c/cff8b520312e750ad38967c30128e1534cbf9484"},{"url":"https://git.kernel.org/stable/c/1dc759571f3df14891175fc52527f7624ba01322"},{"url":"https://git.kernel.org/stable/c/da2e0cfbb620b199927a1e5b93b7cfde32083c7d"},{"url":"https://git.kernel.org/stable/c/2e54d53b65e296b4b4bdc2cdd3b2b58dfa8d8c5c"},{"url":"https://git.kernel.org/stable/c/bdd41b96e814300c66222cf4e47ecb8aef995656"},{"url":"https://git.kernel.org/stable/c/63c5e48d6f7f5722a48f63e13e961dc5302894ed"},{"url":"https://git.kernel.org/stable/c/a3f315be9d30eeb6938d11fa17fd4b32d52f7c42"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00216,"epssPercentile":0.11996,"ingestedAt":"2026-10-18T15:45:12.258Z","slug":"CVE-2026-98569","body":"## Overview\n\nA flaw was found in the Linux kernel's Generic Routing Encapsulation (GRE) subsystem. A local user with network administration privileges could cause a Denial of Service (DoS) by enabling metadata collection on an existing GRE network device through a netlink interface modification request. Because the kernel fails to verify tunnel uniqueness during link modifications, this operation can overwrite shared metadata lookup entries, breaking packet reception for other active tunnel devices in the same network namespace when either device is removed.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98569.json)\n\n**kernel: ip_gre: Reject enabling collect metadata through changelink** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225790,"id":"CVE-2026-98569","ts":1792498454099,"field":"cvss","old":null,"new":"4.4"},{"seq":225789,"id":"CVE-2026-98569","ts":1792498454099,"field":"severity","old":"none","new":"medium"}]}