{"id":"CVE-2026-98816","title":"kernel: bpf: Fix overflow of jump offset in constant blinding (CVE-2026-98816)","summary":"A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem. An integer overflow occurs in the constant blinding mechanism when calculating backward jump offsets during BPF program hardening. A local attacker capable of l…","severity":"medium","cvss":4.1,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-191","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-23","sourceUpdated":"2026-10-23T19:34:19+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98816.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98816.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98816"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555199"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98816"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98816"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98816.mbox"},{"url":"https://git.kernel.org/stable/c/443328237113ee0ea515e506497334d871dbc2aa"},{"url":"https://git.kernel.org/stable/c/ad139384ecddb6f3e7e3c3c12765aafae0e39670"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00162,"epssPercentile":0.05374,"ingestedAt":"2026-10-18T16:47:32.476Z","slug":"CVE-2026-98816","body":"## Overview\n\nA flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem. An integer overflow occurs in the constant blinding mechanism when calculating backward jump offsets during BPF program hardening. A local attacker capable of loading BPF programs could exploit this issue to jump beyond program boundaries, causing a kernel crash and 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 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98816.json)\n\n**kernel: bpf: Fix overflow of jump offset in constant blinding** — 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 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 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\nNot affected:\n\n- Red Hat Enterprise Linux 6\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":23,"depthScoreParts":{"impact":22.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228659,"id":"CVE-2026-98816","ts":1792844840690,"field":"cvss","old":null,"new":"4.1"},{"seq":228658,"id":"CVE-2026-98816","ts":1792844840690,"field":"severity","old":"none","new":"medium"}]}