---
id: CVE-2026-89581
title: >-
  kernel: bpf, x86: Fix per-CPU address resolution into an extended register
  (CVE-2026-89581)
summary: >-
  A flaw was found in the Linux kernel's handling of Berkeley Packet Filter
  (BPF) programs on x86 architecture. An issue with how per-CPU addresses are
  resolved into extended registers can lead to incorrect memory access. A local
  attacker co…
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-476
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: '2026-09-18'
sourceUpdated: '2026-09-18T22:12:21+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89581.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89581.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89581'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532189'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89581'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89581'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89581.mbox
  - url: 'https://git.kernel.org/stable/c/5bbbce02e500d47d8e259a45be5a7be9741d0533'
  - url: 'https://git.kernel.org/stable/c/638bc3aada8ecdece184d5c15b100d489c9cccd7'
  - url: 'https://git.kernel.org/stable/c/6886642414f59f928728802dc2c972a9859e6310'
  - url: 'https://git.kernel.org/stable/c/6a19b18d458881bf3269a357cc6dc6db5eef4369'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00175
epssPercentile: 0.06146
scores:
  vendor: 5.5
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.474Z'
---

## Overview

A flaw was found in the Linux kernel's handling of Berkeley Packet Filter (BPF) programs on x86 architecture. An issue with how per-CPU addresses are resolved into extended registers can lead to incorrect memory access. A local attacker could exploit this by running a specially crafted BPF program. This could cause a kernel panic, resulting in a denial of service (DoS) to the system.

## Vendor advisories

- **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 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89581.json)

**kernel: bpf, x86: Fix per-CPU address resolution into an extended register** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

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