{"id":"CVE-2026-89565","title":"kernel: ipip: fix skb leak in collect_md mode when metadata_dst allocation fails (CVE-2026-89565)","summary":"A flaw was found in the Linux kernel's IP over IP (ipip) tunnel driver. When operating in collect_md mode, the ipip_tunnel_rcv() function fails to free a network packet buffer (skb) if the metadata_dst allocation fails. This oversight lead…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-772","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T22:06:54+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89565.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89565.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89565"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532185"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89565"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89565"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89565.mbox"},{"url":"https://git.kernel.org/stable/c/31e4be21dacee49395013caae28576484a049a4f"},{"url":"https://git.kernel.org/stable/c/6776efe4a52f289a3fc18f8adf19b035a7d8e1bb"},{"url":"https://git.kernel.org/stable/c/6d8c5b266d0035a061573843a7243be068eb6118"},{"url":"https://git.kernel.org/stable/c/fd01f1a3ed4a189a784654f7c69eb565872f2e12"},{"url":"https://git.kernel.org/stable/c/1909df2d066424767429e13053eb9701263430ef"},{"url":"https://git.kernel.org/stable/c/c4dc23de4cc75e4e304170b31bb8aeeacd5cb990"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00172,"epssPercentile":0.06971,"ingestedAt":"2026-09-14T15:23:07.451Z","slug":"CVE-2026-89565","body":"## Overview\n\nA flaw was found in the Linux kernel's IP over IP (ipip) tunnel driver. When operating in collect_md mode, the ipip_tunnel_rcv() function fails to free a network packet buffer (skb) if the metadata_dst allocation fails. This oversight leads to a memory leak. A local attacker could potentially exploit this vulnerability to exhaust system memory, resulting in a Denial of Service (DoS).\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 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 8, Red Hat Enterprise Linux 9, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89565.json)\n\n**kernel: ipip: fix skb leak in collect_md mode when metadata_dst allocation fails** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\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 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 7\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208098,"id":"CVE-2026-89565","ts":1789922708458,"field":"cvss","old":"5.9","new":"5.5"},{"seq":204063,"id":"CVE-2026-89565","ts":1789490231272,"field":"cvss","old":null,"new":"5.9"},{"seq":204062,"id":"CVE-2026-89565","ts":1789490231272,"field":"severity","old":"none","new":"medium"},{"seq":147614,"id":"CVE-2026-89565","ts":1789270211601,"field":"cvss","old":null,"new":"5.9"},{"seq":147613,"id":"CVE-2026-89565","ts":1789270211601,"field":"severity","old":"none","new":"medium"},{"seq":109364,"id":"CVE-2026-89565","ts":1789183731622,"field":"cvss","old":null,"new":"5.9"},{"seq":109363,"id":"CVE-2026-89565","ts":1789183731622,"field":"severity","old":"none","new":"medium"}]}