---
title: "CVE-2026-89452: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability caused by improper cleanup of IOMMU device registration failures in msm_iommu_probe(), letting attackers cause system instability or denial of service, exploit requires triggering device registration failure."
url: https://panop.io/threat-heartbeat/CVE-2026-89452/
---

# CVE-2026-89452 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by improper cleanup of IOMMU device registration failures in msm\_iommu\_probe(), letting attackers cause system instability or denial of service, exploit requires triggering device registration failure.

CVSS base score 8.4 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.20% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89452)

## Details

Type

Use After Free

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/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 for msm\_iommu\_probe() registration failure.

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-2026-89452](https://nvd.nist.gov/vuln/detail/CVE-2026-89452)
- [https://git.kernel.org/stable/c/535a200220ca2c83bc8bf54bd2cbe045d6ee70c4](https://git.kernel.org/stable/c/535a200220ca2c83bc8bf54bd2cbe045d6ee70c4)
- [https://git.kernel.org/stable/c/7f7074a886c4a93e3d12076ce60a510a1ebe400c](https://git.kernel.org/stable/c/7f7074a886c4a93e3d12076ce60a510a1ebe400c)
- [https://git.kernel.org/stable/c/f532401be9312ecd166f616bb74a65b0b4c150fa](https://git.kernel.org/stable/c/f532401be9312ecd166f616bb74a65b0b4c150fa)
- [https://git.kernel.org/stable/c/51e37f9179387b6e3fa64a3d3b4fece1a38b3a02](https://git.kernel.org/stable/c/51e37f9179387b6e3fa64a3d3b4fece1a38b3a02)

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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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