---
title: "CVE-2026-89593: Linux Kernel - Resource Management Vulnerability"
description: "Linux kernel contains a memory reservation underflow vulnerability caused by improper adjustment of hugetlb reservations during unmapping when mapcount is not zero, letting attackers cause resource mismanagement, exploit requires specific memory mapping conditions."
url: https://panop.io/threat-heartbeat/CVE-2026-89593/
---

# CVE-2026-89593 Linux Kernel - Resource Management Vulnerability

Linux kernel contains a memory reservation underflow vulnerability caused by improper adjustment of hugetlb reservations during unmapping when mapcount is not zero, letting attackers cause resource mismanagement, exploit requires specific memory mapping conditions.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.12% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89593)

## Details

Type

Resource Management Vulnerability

Impact

Denial Of Service

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix.

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-2026-89593](https://nvd.nist.gov/vuln/detail/CVE-2026-89593)
- [https://git.kernel.org/stable/c/0f001491e5a2ec69aa9d5dd6b799e5742245f9ea](https://git.kernel.org/stable/c/0f001491e5a2ec69aa9d5dd6b799e5742245f9ea)
- [https://git.kernel.org/stable/c/5120b1e048d48596ffaec1a8412012a91adba73b](https://git.kernel.org/stable/c/5120b1e048d48596ffaec1a8412012a91adba73b)
- [https://git.kernel.org/stable/c/a3c65af20cceb7f997847727636b4017326f845d](https://git.kernel.org/stable/c/a3c65af20cceb7f997847727636b4017326f845d)
- [https://git.kernel.org/stable/c/b0b1b9ca80b795ed2223e76dd787db7067121fb9](https://git.kernel.org/stable/c/b0b1b9ca80b795ed2223e76dd787db7067121fb9)

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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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