{"id":"CVE-2026-98787","title":"kernel: bpf: Fix missing migration protection in __rhtab_map_lookup_and_delete_batch() (CVE-2026-98787)","summary":"A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) subsystem. Missing CPU migration protection during batch lookup and delete operations on hash tables allows a task to migrate between processors while freeing memory. A lo…","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-821","vendor":"Red Hat","product":"Linux","affected":["Linux >= 818e0084822742fc00eacbf5df3476a5e72c7d0e < 94f41ec5fa578765b74ad5736c2f029e7aabc46d","Linux >= 818e0084822742fc00eacbf5df3476a5e72c7d0e < de020dc8049bfb2b22e3b6d99c031feb2e22d112","Linux 7.2"],"published":"2026-10-18","updated":"2026-10-23","sourceUpdated":"2026-10-23T11:17:08+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98787.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98787.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98787"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555148"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98787"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98787"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98787.mbox"},{"url":"https://git.kernel.org/stable/c/94f41ec5fa578765b74ad5736c2f029e7aabc46d"},{"url":"https://git.kernel.org/stable/c/de020dc8049bfb2b22e3b6d99c031feb2e22d112"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00155,"epssPercentile":0.04637,"ingestedAt":"2026-10-18T16:47:32.486Z","slug":"CVE-2026-98787","body":"## Overview\n\nA flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) subsystem. Missing CPU migration protection during batch lookup and delete operations on hash tables allows a task to migrate between processors while freeing memory. A local attacker could exploit this condition to trigger a kernel crash, resulting in a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98787.json)\n\n**kernel: bpf: Fix missing migration protection in __rhtab_map_lookup_and_delete_batch()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\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\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":23,"depthScoreParts":{"impact":22.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228097,"id":"CVE-2026-98787","ts":1792758084063,"field":"cvss","old":null,"new":"4.1"},{"seq":228096,"id":"CVE-2026-98787","ts":1792758084063,"field":"severity","old":"none","new":"medium"}]}