---
id: CVE-2026-89580
title: 'kernel: bpf: Disable preemption in __bpf_get_stack (CVE-2026-89580)'
summary: >-
  A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem.
  A local attacker could exploit a timing issue in the `__bpf_get_stack`
  function. This occurs when a preemptible BPF program is scheduled out,
  allowing another t…
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 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T17:47:42+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89580.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89580.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89580'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532292'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89580'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89580'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89580.mbox
  - url: 'https://git.kernel.org/stable/c/8c5ba022f2085ea42d011497a6e92e527d123b9b'
  - url: 'https://git.kernel.org/stable/c/9a23747909fcae707990c8466c381a0e7acfaa4e'
  - url: 'https://git.kernel.org/stable/c/b1a47b2708d4e95dbd23aee2ec83752190897b3f'
  - url: 'https://git.kernel.org/stable/c/dbfecc8a6631c0d3626c14ba1f1a485a4498445a'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00175
epssPercentile: 0.06216
scores:
  vendor: 6.3
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.474Z'
---

## Overview

A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem. A local attacker could exploit a timing issue in the `__bpf_get_stack` function. This occurs when a preemptible BPF program is scheduled out, allowing another task to overwrite a per-CPU buffer. This leads to an out-of-bounds write, potentially causing memory corruption.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89580.json)

**kernel: bpf: Disable preemption in __bpf_get_stack** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 6

## Remediation

Affected