{"id":"CVE-2026-98568","title":"kernel: vxlan: use one headroom snapshot for neighbour replies (CVE-2026-98568)","summary":"A flaw was found in the Linux kernel's VXLAN (Virtual Extensible LAN) networking module. A race condition can occur when link properties are modified while neighbour advertisement reply packets are being processed, leading to inconsistent …","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-787","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","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-2026-98568.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98568.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98568"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555006"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98568"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98568"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98568.mbox"},{"url":"https://git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6"},{"url":"https://git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14"},{"url":"https://git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7"},{"url":"https://git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb"},{"url":"https://git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.002,"epssPercentile":0.0977,"ingestedAt":"2026-10-18T15:45:12.261Z","slug":"CVE-2026-98568","body":"## Overview\n\nA flaw was found in the Linux kernel's VXLAN (Virtual Extensible LAN) networking module. A race condition can occur when link properties are modified while neighbour advertisement reply packets are being processed, leading to inconsistent buffer size calculations. A local attacker could exploit this timing issue to cause an out-of-bounds write to kernel memory, resulting in a Denial of Service (DoS) via a system crash or potential memory corruption.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98568.json)\n\n**kernel: vxlan: use one headroom snapshot for neighbour replies** — 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 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225788,"id":"CVE-2026-98568","ts":1792498453593,"field":"cvss","old":null,"new":"4.7"},{"seq":225787,"id":"CVE-2026-98568","ts":1792498453593,"field":"severity","old":"none","new":"medium"}]}