---
title: "CVE-2026-89500: Linux Kernel - Denial of Service"
description: "Linux kernel contains a memory management vulnerability caused by mismatched page order handling in ring-buffer's cpu_buffer during concurrent resize, letting attackers cause kernel crashes or memory leaks, exploit requires concurrent ring buffer resize."
url: https://panop.io/threat-heartbeat/CVE-2026-89500/
---

# CVE-2026-89500 Linux Kernel - Denial of Service

Linux kernel contains a memory management vulnerability caused by mismatched page order handling in ring-buffer's cpu\_buffer during concurrent resize, letting attackers cause kernel crashes or memory leaks, exploit requires concurrent ring buffer resize.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89500)

## Details

Type

Denial of Service

Impact

Denial Of Service

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 fix applied.

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-2026-89500](https://nvd.nist.gov/vuln/detail/CVE-2026-89500)
- [https://git.kernel.org/stable/c/7a1fb95de5404134f8758c1295ce88986bdf117c](https://git.kernel.org/stable/c/7a1fb95de5404134f8758c1295ce88986bdf117c)
- [https://git.kernel.org/stable/c/a1dabe68fb53730bc0be60c5dbfd3f4c560084e7](https://git.kernel.org/stable/c/a1dabe68fb53730bc0be60c5dbfd3f4c560084e7)
- [https://git.kernel.org/stable/c/d787d509bdf6c88c85e095247daf7456cb7fb772](https://git.kernel.org/stable/c/d787d509bdf6c88c85e095247daf7456cb7fb772)
- [https://git.kernel.org/stable/c/d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f](https://git.kernel.org/stable/c/d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f)

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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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