{"id":"CVE-2026-98599","title":"kernel: bpf: Reject non-negative offsets in stack_slot_obj_get_spi() (CVE-2026-98599)","summary":"A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) verifier. A local attacker can exploit this flaw to cause kernel memory corruption and potentially achieve privilege escalation or a denial of service (system crash). This…","severity":"medium","cvss":6.7,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-1285","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":"2026-10-20T05:16:15+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98599.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98599.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98599"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554970"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98599"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98599"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98599.mbox"},{"url":"https://git.kernel.org/stable/c/89a7241fc7ecc1b5e47c3f071081e314523b8d9d"},{"url":"https://git.kernel.org/stable/c/79a9172f3ab4ad8392c5e5c8944b9b7710ade620"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00189,"epssPercentile":0.08471,"ingestedAt":"2026-10-18T15:45:12.244Z","slug":"CVE-2026-98599","body":"## Overview\n\nA flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) verifier. A local attacker can exploit this flaw to cause kernel memory corruption and potentially achieve privilege escalation or a denial of service (system crash). This vulnerability occurs because the verifier fails to reject non-negative stack offsets, allowing a crafted BPF program to improperly access and interpret memory outside the allocated stack boundaries.\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-2026-98599.json)\n\n**kernel: bpf: Reject non-negative offsets in stack_slot_obj_get_spi()** — 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 Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":37,"depthScoreParts":{"impact":36.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225710,"id":"CVE-2026-98599","ts":1792498382212,"field":"cvss","old":null,"new":"6.7"},{"seq":225709,"id":"CVE-2026-98599","ts":1792498382212,"field":"severity","old":"none","new":"medium"}]}