{"id":"CVE-2026-98603","title":"kernel: kernel: Denial of service via race condition in ovpn (CVE-2026-98603)","summary":"A flaw was found in the Linux kernel's OpenVPN (ovpn) module. A local user can cause a Denial of Service (DoS) or network disruption during concurrent network traffic when an outdated local source address is cleared. Because the address is…","severity":"low","cvss":2.5,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L","cvssSource":"vendor","cwe":"CWE-20","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-10-18","updated":"2026-10-20","sourceUpdated":"2026-10-20T08:12:45+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98603.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98603.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98603"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554975"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98603"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98603"},{"url":"https://git.kernel.org/stable/c/72bd1bea37ea2c8553938f086bf48ccd2147dfe1"},{"url":"https://git.kernel.org/stable/c/7d8104988f423572df1f3347ce578037b1043f34"},{"url":"https://git.kernel.org/stable/c/c44a04722f7dae9a45a101b8e100931ab59f1c18"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00198,"epssPercentile":0.09494,"ingestedAt":"2026-10-18T15:45:12.247Z","slug":"CVE-2026-98603","body":"## Overview\n\nA flaw was found in the Linux kernel's OpenVPN (ovpn) module. A local user can cause a Denial of Service (DoS) or network disruption during concurrent network traffic when an outdated local source address is cleared. Because the address is modified in place without proper synchronization, concurrent transmission operations may read a torn, partially updated address, leading to incorrect routing and packet transmission failures.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98603.json)\n\n**kernel: kernel: Denial of service via race condition in ovpn** — rated Low by Red Hat. Released 2026-10-18, updated 2026-10-20.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n\n## Remediation\n\nFix deferred\n\nWorkarounds / mitigations:\n\n- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"sunlit","depthScore":14,"depthScoreParts":{"impact":13.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225686,"id":"CVE-2026-98603","ts":1792498358776,"field":"cvss","old":null,"new":"2.5"},{"seq":225685,"id":"CVE-2026-98603","ts":1792498358776,"field":"severity","old":"none","new":"low"}]}