---
title: "CVE-2026-89805: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free and allocation fallback issue in drm_pagemap_migrate_populate_ram_pfn() caused by improper handling of higher-order folio allocations and reference counting, letting attackers cause kernel instability or denial of service, exploit requires kernel-level access."
url: https://panop.io/threat-heartbeat/CVE-2026-89805/
---

# CVE-2026-89805 Linux Kernel - Use After Free

Linux kernel contains a use-after-free and allocation fallback issue in drm\_pagemap\_migrate\_populate\_ram\_pfn() caused by improper handling of higher-order folio allocations and reference counting, letting attackers cause kernel instability or denial of service, exploit requires kernel-level access.

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-2026-89805)

## Details

Type

Use After Free

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

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for drm\_pagemap allocation fallback and use-after-put issues.

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-2026-89805](https://nvd.nist.gov/vuln/detail/CVE-2026-89805)
- [https://git.kernel.org/stable/c/10e92e18e3dab081789d868878f2ecce6166948a](https://git.kernel.org/stable/c/10e92e18e3dab081789d868878f2ecce6166948a)
- [https://git.kernel.org/stable/c/df72e55e754c8d449321ddddad19a8bd3cb8d032](https://git.kernel.org/stable/c/df72e55e754c8d449321ddddad19a8bd3cb8d032)

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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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