{"id":"CVE-2026-98793","title":"kernel: netfilter: bpf: reject invalid NAT manipulation types (CVE-2026-98793)","summary":"A flaw was found in the Linux kernel's netfilter subsystem. Missing validation of Network Address Translation (NAT) manipulation types in BPF connection tracking helpers allows a local user with permissions to run BPF programs to trigger a…","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-824","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":"2026-10-23","sourceUpdated":"2026-10-23T15:23:25+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98793.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98793.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98793"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555143"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98793"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98793"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98793.mbox"},{"url":"https://git.kernel.org/stable/c/752492947be3123ea6c689e2f93ae04ecd675d42"},{"url":"https://git.kernel.org/stable/c/ea777dc90ab37e64fa4b92f6fcf3b5edcef5e058"},{"url":"https://git.kernel.org/stable/c/f6143ae109df56d51d5536e813deb19eee7a6205"},{"url":"https://git.kernel.org/stable/c/58108f05b0502448f6bb612ee2eccc63bd6449cb"},{"url":"https://git.kernel.org/stable/c/16d464013ec2267b00a83f4bfbb97b3ecc63bfa7"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00168,"epssPercentile":0.05991,"ingestedAt":"2026-10-18T16:47:32.484Z","slug":"CVE-2026-98793","body":"## Overview\n\nA flaw was found in the Linux kernel's netfilter subsystem. Missing validation of Network Address Translation (NAT) manipulation types in BPF connection tracking helpers allows a local user with permissions to run BPF programs to trigger a system crash. By supplying an invalid manipulation type, an attacker can cause the kernel to access uninitialized data structures or trigger a kernel panic, 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 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 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98793.json)\n\n**kernel: netfilter: bpf: reject invalid NAT manipulation types** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.\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 Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228740,"id":"CVE-2026-98793","ts":1792844945324,"field":"cvss","old":null,"new":"4.4"},{"seq":228739,"id":"CVE-2026-98793","ts":1792844945324,"field":"severity","old":"none","new":"medium"}]}