---
title: "CVE-2026-89579: Linux Kernel - Privilege Escalation"
description: "Linux kernel contains a local privilege escalation vulnerability in bpf bloom filter sizing and indexing on 32-bit kernels caused by under-allocation and incorrect bit indexing, letting local attackers with CAP_BPF escalate privileges."
url: https://panop.io/threat-heartbeat/CVE-2026-89579/
---

# CVE-2026-89579 Linux Kernel - Privilege Escalation

Linux kernel contains a local privilege escalation vulnerability in bpf bloom filter sizing and indexing on 32-bit kernels caused by under-allocation and incorrect bit indexing, letting local attackers with CAP\_BPF escalate privileges.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89579)

## Details

Type

Privilege Escalation

Impact

Privilege Escalation

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the bpf bloom filter sizing and indexing fix on 32-bit kernels.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89579](https://nvd.nist.gov/vuln/detail/CVE-2026-89579)
- [https://git.kernel.org/stable/c/dff481e12b3f127739f6a4ea7cef2c25dc12e056](https://git.kernel.org/stable/c/dff481e12b3f127739f6a4ea7cef2c25dc12e056)
- [https://git.kernel.org/stable/c/80551bf8912c42d1e3d55eec6fa3c40f306c3de8](https://git.kernel.org/stable/c/80551bf8912c42d1e3d55eec6fa3c40f306c3de8)
- [https://git.kernel.org/stable/c/a6183bc683f97f4317f7e84939ca7fff37c5688b](https://git.kernel.org/stable/c/a6183bc683f97f4317f7e84939ca7fff37c5688b)
- [https://git.kernel.org/stable/c/11c1e836710dcba03e50454a4eedfdbaf8d3050e](https://git.kernel.org/stable/c/11c1e836710dcba03e50454a4eedfdbaf8d3050e)
- [https://git.kernel.org/stable/c/272fcb4ba6fab678db0eb966dc81c4c804bef64a](https://git.kernel.org/stable/c/272fcb4ba6fab678db0eb966dc81c4c804bef64a)
- [https://git.kernel.org/stable/c/3b7a13eccfcf97714ffc1ca6aa663d66d4a30e29](https://git.kernel.org/stable/c/3b7a13eccfcf97714ffc1ca6aa663d66d4a30e29)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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