{"id":"CVE-2026-98800","title":"kernel: kernel: Denial of Service via use-after-free in BPF trampoline (CVE-2026-98800)","summary":"A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem. When a BPF program attached to a trampoline is detached, the kernel may release the program's memory prematurely before preempted tasks have safely completed ex…","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-416","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-10-18","updated":"2026-10-21","sourceUpdated":"2026-10-21T01:25:07+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98800.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98800.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98800"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555072"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98800"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98800"},{"url":"https://git.kernel.org/stable/c/0fb5751a6e411b1b466c06e50021818d9391df98"},{"url":"https://git.kernel.org/stable/c/40955f6512a03f0e046f5256b0706b26ba191018"},{"url":"https://kernelcve.org/list/?q=CVE-2026-98800"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00155,"epssPercentile":0.0462,"ingestedAt":"2026-10-18T16:47:32.482Z","slug":"CVE-2026-98800","body":"## Overview\n\nA flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem. When a BPF program attached to a trampoline is detached, the kernel may release the program's memory prematurely before preempted tasks have safely completed execution. A local user can exploit this race condition to access freed memory, resulting in a kernel crash and Denial of Service (DoS) or potential memory corruption.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98800.json)\n\n**kernel: kernel: Denial of Service via use-after-free in BPF trampoline** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-21.\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":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":227136,"id":"CVE-2026-98800","ts":1792585148766,"field":"cvss","old":null,"new":"4.7"},{"seq":227135,"id":"CVE-2026-98800","ts":1792585148766,"field":"severity","old":"none","new":"medium"}]}