{"id":"CVE-2026-89579","title":"kernel: bpf: Harden bloom filter sizing and indexing on 32-bit kernels (CVE-2026-89579)","summary":"A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) component, specifically impacting 32-bit systems. This vulnerability stems from incorrect sizing and indexing of bloom filters, which can lead to out-of-bounds memory acce…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-787","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T14:05:35+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89579.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89579.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89579"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532482"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89579"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89579"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89579.mbox"},{"url":"https://git.kernel.org/stable/c/a6183bc683f97f4317f7e84939ca7fff37c5688b"},{"url":"https://git.kernel.org/stable/c/80551bf8912c42d1e3d55eec6fa3c40f306c3de8"},{"url":"https://git.kernel.org/stable/c/3b7a13eccfcf97714ffc1ca6aa663d66d4a30e29"},{"url":"https://git.kernel.org/stable/c/272fcb4ba6fab678db0eb966dc81c4c804bef64a"},{"url":"https://git.kernel.org/stable/c/dff481e12b3f127739f6a4ea7cef2c25dc12e056"},{"url":"https://git.kernel.org/stable/c/11c1e836710dcba03e50454a4eedfdbaf8d3050e"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00167,"epssPercentile":0.06385,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.451Z","slug":"CVE-2026-89579","body":"## Overview\n\nA flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) component, specifically impacting 32-bit systems. This vulnerability stems from incorrect sizing and indexing of bloom filters, which can lead to out-of-bounds memory access. A local attacker with CAP_BPF capabilities could exploit this to escalate their privileges on the system.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · 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 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89579.json)\n\n**kernel: bpf: Harden bloom filter sizing and indexing on 32-bit kernels** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-15.\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 OpenShift Container Platform 4\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203863,"id":"CVE-2026-89579","ts":1789490210270,"field":"cvss","old":"7.8","new":"7"},{"seq":197908,"id":"CVE-2026-89579","ts":1789384320902,"field":"cvss","old":"6.7","new":"7.8"},{"seq":197907,"id":"CVE-2026-89579","ts":1789384320902,"field":"severity","old":"medium","new":"high"},{"seq":183457,"id":"CVE-2026-89579","ts":1789356675444,"field":"cvss","old":"7.8","new":"6.7"},{"seq":183456,"id":"CVE-2026-89579","ts":1789356675444,"field":"severity","old":"high","new":"medium"},{"seq":153392,"id":"CVE-2026-89579","ts":1789285350330,"field":"cvss","old":null,"new":"7.8"},{"seq":153391,"id":"CVE-2026-89579","ts":1789285350330,"field":"severity","old":"none","new":"high"},{"seq":147127,"id":"CVE-2026-89579","ts":1789270195540,"field":"cvss","old":null,"new":"6.7"},{"seq":147126,"id":"CVE-2026-89579","ts":1789270195540,"field":"severity","old":"none","new":"medium"},{"seq":108880,"id":"CVE-2026-89579","ts":1789183729379,"field":"cvss","old":null,"new":"6.7"},{"seq":108879,"id":"CVE-2026-89579","ts":1789183729379,"field":"severity","old":"none","new":"medium"}]}