---
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: 0.05263
scores:
  vendor: 7
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.451Z'
---

## Overview

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 access. A local attacker with CAP_BPF capabilities could exploit this to escalate their privileges on the system.

## Vendor advisories

- **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)

**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.

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

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4

## Remediation

Affected